Community mediation is playing an increasingly important role in terms of resolving contradictions among the people，which is as an informal means of social control and is one of the most important mediation systems. Meanwhile，as the core of the community mediation，trust mechanism also plays a fundamental role. The Article starts from the two community mediation cases and compares with the similarities and differences that exist in the mediation，generalizing the logical operation of the trust mechanism and its influencing factors on this basis.

That mediation in the M community is seeking “local justice” based on “local identity”，which leads to its use of specific mediation habitus is “mutual affection based，supplemented by justification，followed by law” and is influenced on the “local features” which is relied on seniority and prestige and obtains the “local trust”；while the mediation in K community based on the “legal identity” is seeking “legal justice”，resulting in a specific order in which the use of mediation habitus is “law-based，supplemented by justification，followed by mutual affection” and is influenced on the “legality features” which is relied on legal status and obtains the “legal trust”. The survey found that the two community mediators all use “empathy” as the main method in mediation. At the same time，there is the model of trust mechanism to “trust stock” and “trust incremental” as the core of the trust research，namely the logic of trust mechanism is that the mediator uses “trust stock” to obtain the “trust incremental”，and by the means of the appropriate habitus of mediation in resolving disputes in order to make the process form a virtuous circle.