Abstract：In view of the network morals and realistic moral collision，the virtual world of confrontation，confrontation and fusion and the other problems，using the system analysis method, based on the analysis of the environmental differences in the formation and development of network morals and realistic moral，the similarities and differences in the moral evaluation standard，moral restraint mechanism，the actual utility of network are explored. Network morality pays great attention to the effectiveness of maintaining the overall order of the network society and the interests of the majority of Internet users and puts emphasis on openness, diversity and sharing. The network morality has positive and negative counter effect on the real morality. Realistic morality provides an objective reference object and evaluation system for network morality. The construction of network morality must meet the requirements of virtual space, and live in harmony with the reality of morality, in order to achieve healthy and harmonious development.