Abstract: Social trust is the embodiment of the judgments and opinions of the social members on the status quo and the trend of social development, which is based on the state of the deep consciousness reaction to external things consistent and stable psychological preparation. Interpersonal trust and organizational trust are the important components of the social trust. Under the background of the cultural development, urban functional difference, the Chinese society transformation and the development in Beijing and Shanghai, let “city people” in the social trust relationship not only represent the common, but also highlight the differences in the background of modernization, this is a traditional culture modernization in the process of fibrillation and the Chinese modern history of one hundred years of concentrated development.