At present, with the continuous in-depth development of the construction industry, its development direction and research focus are constantly changing. Green construction is a new key project established in practice. However, due to the influence of internal and external factors, green construction faces many challenges. Therefore, this paper analyzes the problems existing in the management of green building projects.

1 Overview of Green Building

Green building is a comprehensive application of various technologies, and its purpose is to ensure the comfort of people's lives to the greatest extent without causing serious damage to the ecological environment system inside the building. Using natural lighting and natural ventilation, people can get the experience of returning to the natural environment, meet the changes of living environment, live happily in a harmonious and comfortable environment, and make the concept of sustainable planning and development rooted in the construction process of green buildings. The meaning of green building includes energy saving and reuse. Users should be fully respected, people's internal needs should be understood, and the geographical environment and overall design concept should be respected. According to the published evaluation standards of green buildings, it can be concluded that a series of resource consumption problems, including water resources, land resources and energy consumption, should be controlled as much as possible under the premise of ensuring the service life of green buildings. At the same time, the pollution of ecological environment should also attract the attention of relevant units and departments to keep people's living environment clean and comfortable. Therefore, at present, it is widely recognized that green buildings refer to the types of buildings that can develop harmoniously with the natural ecological environment.

2 actual situation

2. 1 The concept of green building is vague.

Many practitioners in the construction industry are very vague about the concept of green building, thinking that facilities with green plants are green buildings, without considering the impact of energy consumption, carbon dioxide and other gas emissions on the indoor environment, people's satisfaction with living and other issues, blindly thinking that green buildings should adopt high-end technical methods. These concepts make the development of green buildings fall into the dilemma of inequality, unfairness, high cost consumption and high price sales, thus limiting the development of green buildings. Generally speaking, many local governments and real estate enterprises related to the implementation and construction of green buildings are very vague about the concept of green buildings, and they fail to fully instill the knowledge and concepts of green buildings into the practice processes such as pre-design, construction process layout, construction planning process and on-site supervision and management. If we continue to ignore this situation, the large-scale construction of green buildings in China and the expansion of its influence on urban construction will be greatly impacted and will not be able to meet the requirements of green building construction [1].

2.2 the system is not perfect

After introducing the concept of green building, institutions at all levels actively formulate relevant normative documents and arrange their implementation. However, through a certain investigation, it is found that the existing verification and certification standards for green buildings still have defects. The planning process of green building includes the formulation of green building scheme, the selection of raw materials and the overall operation supervision of green building industry. At present, there is no clear implementation method for these contents, which has a negative impact on the comprehensive protection and control of land resources, water resources, saving raw materials and other ecological resources.

2.3 the effectiveness of policy application is not high.

In the process of energy management of green buildings in China, the key points of management are not well understood. Generally speaking, the focus of management should be the development of green building energy-saving technology and the standardized development of green building industry, but the actual situation is in the field of industrial and traffic energy conservation [2]. Relevant departments should take double measures of reward and punishment: give material and spiritual rewards to some institutions with good performance, and punish those institutions with poor performance accordingly, and the punishment intensity depends on the actual situation. This is the inevitable way to achieve job requirements and job indicators. In the process of formulation and implementation, we should pay attention to the climate, geography, economy and other conditions in the area where the construction site is located, and constantly adjust and innovate in the practice process to ensure continuous adaptation to the needs of reform and development in specific areas.

3 the main countermeasures to solve the problem

3. 1 Implement target control and process control.

1) goal control, that is, the macro goal of building a green building is decomposed into a series of small goals, and the small goals are compared in adjacent levels. 2) Process control, that is, collecting real-time data of control points in each stage, and analyzing and correcting the target deviation in the control process at the first time.

3.2 Improve the incentive and supervision mechanism

In order to ensure the smooth development of construction planning, it is very important to improve the competition mechanism in the process of project management and select outstanding talents through the competition mechanism. In addition, it is necessary to improve the reward and punishment mechanism, which can mobilize the enthusiasm of employees to a certain extent, so that the salary of employees is linked to their work ability, and there will be no big imbalance [3]. Employees with good working attitude should be rewarded accordingly, otherwise employees with slack working attitude should be punished, and the degree of rewards and punishments should follow appropriate standards.

3.3 Strengthen safety construction management

The safety problem in the process of green building construction is the most important. The safety management of the construction site is mainly to prevent danger and maintain safety. In this regard, we can adopt a closed management model. Closed management can prevent all kinds of security problems to some extent. Before construction, the construction unit should establish and gradually improve the safety production mechanism, so that the staff can have evidence to follow and define the relevant work standards. The quality of safety management of construction projects is directly related to the economic benefits and social reputation of enterprises. This method can effectively supervise the safety of the construction site, which should attract the attention of enterprises and construction personnel.

3.4 Improve the evaluation system

We must accurately evaluate the conditions of enterprises according to the evaluation requirements of green buildings. First of all, it is necessary to clarify the working standards of green building design, construction, acceptance and other stages, and clarify vague concepts. Construction units that fail to meet the requirements of green standards cannot pass the batch review, and relevant regulatory authorities should fulfill their duties and strictly follow the regulatory standards.

3.5 Establish and improve the scientific green construction management system.

In order to effectively promote the stable development and wide application of green construction technology in building construction, it is necessary to establish a scientific and reasonable construction management system, supervise and guide all departments in the construction process, effectively apply the concept of green construction management to construction management, and regularly check and accept the construction site to ensure the effective application of green construction technology in building projects.

3.6 Use of clean energy

With the continuous progress of science and technology, a series of renewable and clean energy technologies such as solar energy and wind energy are gradually widely used in buildings, especially solar energy. The first application of solar energy in green buildings is power generation. At present, there are two kinds of solar power generation systems: independent photovoltaic power generation system and parallel power generation system. You can choose green buildings according to the actual situation. It is precisely because of the application of solar power generation system that the lighting industry in China has made great progress and promoted the development of green buildings. At the same time, the application of solar hot water system is also very common. In the future, the integration of photovoltaic solar energy and buildings will inevitably become an important development trend of the application of solar water heating system in the future, and of course it is also an important content of the development of green buildings [4].

With the enhancement of people's awareness of environmental protection, the requirements for the construction industry are becoming more and more strict. We should build green buildings on the premise of protecting the environment. "Sustainable development strategy" has been widely concerned and valued in recent years. The development of green building needs the cooperation of Qi Xin, an elite in the construction industry. Under the premise of responding to the call of the state, it will save all kinds of resources and energy to the maximum extent, protect the ecological environment and make the green building develop continuously.

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