The author of this paper tried to find out the relationship between employees' social network structural factors and internal marketing(IM) mechanism.The purpose of this paper,therefore,is threefold:(1) to prove the effect of social network on IM;(2) to find out the leverage therein;(3) and an IM model based upon social network structural analysis,the conditions thereupon,by means of empirical method.In this research,organizational commitment,a key element in IM,was found to be negatively related with affective and communication dimensions in the employees' social network.