The mechanism of (1) is different. Administrative supervision is an external compulsory constraint imposed by the government on the behavior of the subject of bidding by means of administrative rules, instructions, inspections and penalties according to laws and policies. Industry self-discipline is the self-behavior constraint generated by the bidding subject and its employees in the internal checks and balances mechanism constructed by self-discipline organizations;

(2) different levels of action. With the transformation of government functions, administrative supervision focuses on the macro and overall level, which mainly restricts the commonness and outstanding behavior of market subjects. Industry self-discipline is to implement the macro-supervision level of the government to the micro-supervision level of enterprises and individuals, and to supervise and constrain the specific professional behaviors of all enterprises and their employees. At the same time, industry self-regulatory organizations can provide consulting services for government decision-making, assist the government to strengthen industry overall coordination, and safeguard the overall and long-term interests of the industry according to law;

(3) Different forms of action. Administrative supervision mainly restricts the behavior of the bidding subject through legislation, law enforcement and illegal punishment. Industry self-discipline mainly uses system guidance, training and education, warning and prevention, communication and coordination, supervision and inspection, correction and control, violation punishment and other means to constrain the behavior of bidding subjects in the whole process, multi-links and multi-ways;

(4) The effect is different. The administrative supervision behavior is mandatory, authoritative and deterrent, but in the face of extensive, complex and dynamic market subjects and their market behaviors, it often lacks pertinence, operability and timeliness, and the administrative supervision law enforcement is costly and inefficient. Industry self-discipline can make full use of the role of social supervision and discover the problems existing in the market order as soon as possible. At the same time, we can take self-discipline measures such as guidance, coordination, inspection, correction and formulation of corresponding industry rules in time according to the different actual conditions of the market and enterprises and the reasons for violations, so as to help enterprises and individuals reflect and effectively solve the related demands and problems that induce violations. However, industry self-discipline must be supported by administrative and judicial supervision. Industry self-discipline and administrative supervision must be combined to complement each other, so that macro-management and micro-management can complement each other and effectively maintain and standardize the bidding market order.