Based on data collected from 913 questionnaires conducted in field study in Beijing and Xi’an，by using bivariate probit model and binary probit model，and taking traceable pork as a case study，we conducted an empirical analysis on the effect of information source trust on consumer’s food buying behavior. The following findings are concluded from the research results：consumer’s perception of traceable foods is not high in general，and the percentage of those who have bought traceable pork is not high either. Television，internet，and food label are the principal channels to consumers to obtaining information of traceable foods；in general，the consumer confidence in traceable pork is high，while the overall trust on disseminator of pork traceability information is not high；the variables of information source trust significantly affect the consumer confidence in traceable pork，and variables of consumer confidence significantly affect consumer’s buying behavior of traceable pork. By directly affecting consumer confidence in traceable pork，information source trust can indirectly affect consumer buying behavior of traceable pork；the variables including income level，category of buyer，buying place，profession，and regions，show the significant effect on consumer buying behavior of traceable pork. At the end of the paper，the corresponding policy recommendations were put forward based on the research conclusions.