Abstract: Agricultural products supply chain (ASC) is different from industrial supply chain, knowledge sharing (KS) activities and corresponding influencing factors in the chain are different too. The paper establishes influencing factors model of KS in the specific ASC situation in China, the relevant empirical analysis is conducted with questionnaire and structure equation modeling (SEM). The results show that the ASC’s stability, informatization level, culture atmosphere have positive impact on KS effects; the chain’s length has significant negative impact on its stability, thereby it has negative impact on KS effects with knowledge distance between nodes. Relevant management enlightenment is obtained on the basis of empirical results.