With the advent of the information age, the Internet has become an important way for college students to acquire knowledge and exchange thoughts and feelings. However, the Internet has also had many adverse effects on their mental health, which has attracted more and more social attention. 1 Negative influence of network on college students' psychology 1. 1 The negative influence of network on college students' cognition refers to the process of transforming, inducing, expounding, storing and using sensory input, that is, the process of people thinking and feeling things at a certain moment [1]. As the fourth largest new media, the Internet has massive information storage and dissemination. On the Internet, when faced with a large number of high-speed information, college students often just switch to web browsing quickly, but they can't leave a deep impression in their minds. Therefore, long-term contact with the network will reduce the perception ability of college students and lead to "adaptation" of perception. The so-called perception "adaptation" means that people tend to reduce their sensitivity to the same thing after perceiving it for a long time. Secondly, network information will lead to indigestion of information content for college students. College students can get a lot of information online in a short time. However, when the input of external information exceeds people's normal load, that is, information overload, it is easy to cause people's psychological pressure and confusion. Thirdly, because of the high visualization of network information, the way of thinking of college students has changed to a certain extent, which makes them unwilling to think deeply and lazy to ask the essence of things to some extent. In addition, while thinking too vividly, college students rely too much on ready-made information and ignore practice, which hinders the deepening of the thinking process. The negative influence of 1.2 network on college students' emotions is very colorful. With the continuous development of self-awareness and increasing new demands, their emotions are increasingly rich, intense and passionate, showing the characteristics of impulsiveness and explosiveness. They are very sensitive to all kinds of things. Once the mood breaks out, even if the situation disappears, it will be transformed into a state of mind, and its influence will last for a long time [2]. College students need to express their emotions in their growth, and they need opportunities for self-emotion and social conflict. They should not only express their happiness, anger, sadness and joy, but also accept the happiness, anger, sadness and joy from the surrounding environment and others. Only by being in the atmosphere of emotional interaction between people can college students develop, improve and enrich their emotional world. Although emotional interaction can also be carried out through words and symbols in the network, there is still a difference between face-to-face communication and expression and reality. On the internet, college students are faced with machines without thoughts and feelings. No matter how wonderful and vivid the webpage is, it is also a machine interface. The network only displays and transmits information in a stylized way. People cannot experience and feel the emotional color of face-to-face communication. Over time, it will inevitably lead to emotional loss and indifference. In reality, they don't want to show their emotions, and they don't want to accept others' emotional expressions, and they don't feel the richness of real life, resulting in emotional alienation and loss. The negative influence of 1.3 network on college students' spiritual will. The all-encompassing virtual world of the network has great attraction to college students, especially those students with poor self-control, who tend to unconsciously have strong psychological dependence on the feelings and experiences gained in the network, and finally can't get rid of it, leading to internet addiction. This phenomenon is very similar to pathological gambling, and it is compulsive and out of control. In the real world, college students with Internet addiction often lack willpower, lose concentration in class and even daydream. Indifferent to school, family, classmates, etc. But they are always worried about the online world and hope to get online again. Once they get online, they can't control their online time, which leads to excessive use of the internet. Over-reliance on the Internet makes these college students lose their lofty ideals. They are often highly excited when they go online, but they are decadent and depressed when they go offline. 1.4 the negative influence of the internet on the personality of college students. From the psychological point of view, personality is a unique pattern that constitutes a person's thoughts, emotions and behaviors. This unique model contains a stable and unified psychological quality, which distinguishes one person from others. [3] It includes both external behaviors and their manifestations, as well as internal mental and mental states. It is the sum total of individual's psychological and behavioral characteristics, which is the overall situation and way presented in social life. [4] Self-awareness is the core content of personality. In the era of advocating and pursuing individuality, the network can greatly strengthen college students' self-awareness, but it may also lead to the expansion of college students' self-awareness and the weakness of collective consciousness. "On the Internet, no one knows that you are a dog" vividly describes the virtual and anonymous characteristics of the Internet. The virtual and anonymous characteristics of the network can make college students show more indulgent and arbitrary behavior patterns. On the one hand, it may lead to the out-of-control behavior of college students and the emergence of dual personality or multiple personality disorders, on the other hand, it will also make them realize the false side. In the network interface, college students are always skeptical about information when they can't tell whether it is true or not. This attitude can easily be brought into real life, which affects the healthy development of college students' personality and makes them form paranoid personality disorder of suspicion and distrust. The negative influence of 1.5 network on college students' morality. The original design concept of the Internet is to let information spread freely, but the development of the Internet has also caused moral social problems and affected the healthy development of college students' morality. Cyberspace breaks the traditional moral education model of college students, schools, families and society, and makes the diversified network ethical information of different races and countries often collide with the existing and emerging moral concepts in teenagers' minds. Diversified anarchist moral knowledge may be more easily accepted by college students whose moral beliefs have not yet been formed. On the other hand, college students' moral feelings are mainly intuitive and concrete, which are related to the direct moral situation and concrete moral image. However, the Internet has seized the soil and space for the growth of college students' moral emotion and moral will, but it cannot provide a suitable moral situation. The reduction of intuitive and vivid moral emotional experience of college students eventually leads to the failure of many ways and methods used to enrich college students' moral emotional experience and cultivate the quality of moral will. [5] 1.6 The negative influence of network on college students' interpersonal communication. Communication Media Computer (CMC) is interpersonal communication through computer network. [2] Different from traditional interpersonal communication, online interpersonal communication has the characteristics of anonymity, equality, freedom, indirectness of communication methods and infinity of communication objects. The negative influence of network interpersonal communication on college students' outlook on life, values and morality is (1). In network communication, because in most cases, we can only judge or imagine each other through text description or voice, it is easy to be confused by the text description of the network communication object. The anonymity and security of the Internet make it easier for people with ulterior motives to express negative opinions and spread decadent ideas. College students' long-term contact with the internet will inevitably lead to a considerable number of people being polluted by social garbage, which will lead to the distortion of their outlook on life, values and morality. (2) lead to alienation of interpersonal relationships. Dependence and even infatuation with the Internet have greatly reduced college students' interpersonal communication and replaced it with virtual interpersonal relationship. With the appearance of virtual things such as "digital individual" and "virtual self", it is difficult for people to form real, safe and reliable interpersonal relationships with virtual members in the virtual world. A survey [6] shows that 53.0% of college students can't tell whether there is real friendship on the Internet. Enthusiasm in virtual communication leads to alienation from friends in real life, which makes college students' interpersonal relationship dull and their communication ability decline, and individuals are prone to psychological obstacles such as anxiety, loneliness, depression and indifference. 2 Countermeasures of network mental health education The content of traditional mental health education should be said to be quite rich, but with the increasing influence of this new thing, the content of mental health education still needs to be further enriched. 2. 1 Strengthening network awareness education should make college students clearly realize that the network is a double-edged sword, and excessive use will have a negative impact on body and mind; Educate college students to improve their ability to observe and distinguish network information, learn and absorb it selectively, and cultivate correct network mental health concepts and good network usage habits. 2.2 Actively construct the position of online mental health education, offer online mental health education courses, and incorporate online mental health education into the formal education system of college students; Establish a mental health education website, carry out offline and online psychological counseling, make full use of the virtual and anonymous characteristics of the network, and carry out online mental health counseling; Establish college students' online mental health files and a supervision and early warning mechanism for mental health problems, and actively provide psychological counseling and counseling for college students with problems [7]. 2.3 The combination of network culture and campus culture construction can guide students to actively participate in network culture construction. We can use online e-books to attract students' attention and improve their entrepreneurial awareness and ability to actively adapt to the development of the network. Rich campus cultural life is beneficial for college students to put more time and energy into reality, which is of positive significance to prevent network dependence. In view of the tendency of some college students to escape from reality on the Internet, colleges and universities can organize campus amateur cultural life with various forms and novel contents, so that they can get rid of the virtual world and treat it correctly. 2.4 Strengthening students' network moral education The so-called network moral education is to take the Internet as the carrier, make full use of the functional advantages of the Internet, and carry out distinctive moral education. Today, with the rapid development and increasing popularity of network technology, in the face of the proliferation of "pornography, blackness and poison" on the network, more and more people call for the establishment of network ethics, standardize people's online behavior and maintain network order. To strengthen the network moral education of college students, we should pay special attention to cultivating their autonomy, consciously being the master of the network, observing the network rules, not spreading illegal news, not using dirty words, respecting the privacy of others and consciously maintaining the normal order of the network. Therefore, the school can help college students learn to judge and choose by organizing special lectures, reports, seminars and exchanges, enhance their awareness of legal system, responsibility, self-discipline and safety, and actively guide them to establish a correct network morality. 2.5 Actively advocate college students' self-education. The construction of college students' network mental health needs not only the efforts of schools and society, but also the active self-education of college students. Self-education of college students' mental health means that college students promote the development of mental health through self-education. In view of the manifestations of college students' mental health, such as cognitive disorder, emotional disorder, will disorder and personality disorder, we can carry out mental health education through the important links of self-education, such as correctly understanding ourselves, actively encouraging ourselves and actively adjusting ourselves. Self-regulation, self-venting, self-sublimation and desensitization punishment in self-education can change cognitive ability and achieve the coordination and unity of psychology and environment, psychology and behavior. Reference [1] Long Yan. Research on College Students' Mental Health Education under the Network Environment [D]. Master's Degree Thesis of Higher Education, Wuhan University of Technology, 2005: 10 [2] Hao. Research on College Students' Network Mental Health [D]. Master's degree thesis on Marxist theory and ideological and political education of Hohai University, 2003: 13 [3] Peng Yuling. General psychology [M]. Revised edition. Beijing: Beijing Normal University Press, 2004: 440 [4] Fan Fumin. Research on College Students' Mental Health Education [M]. Beijing Tsinghua University Press 2002: 138. In 2005,15 (11): 243 [6] Chen Songying. Mental health problems and countermeasures of college students in the network age [J]. China Health Education, 2005,21(3):192 [7].