Tolerance is the positive mental state that one can treat values，manners，and other social beings peacefully and inclusively. It consists tertiary level：interpersonal tolerance，intergroup tolerance，and cultural tolerance. Tolerance on each level could serve as a particular source of trust to facilitate social trust. A recognition-contagion model is proposed in this paper to postulate the mutual construction relationship between social tolerance and social trust. The bottom-to-top contagion mechanism acts from interpersonal to intergroup then to the cultural level，while the top-to-bottom recognition mechanism acts from cultural to intergroup to personal level. Better measurable dimensions and indexes and more empirical evidence are needed to support this model.