Based on marketing control theory, The purpose of this study is to investigate the indirected relationships between internal marketing and customer orientation, and relationships between customer orientation and service quality. The lyric survey data by questionnaire is obtained from life insurance industry in Taiwan, items and constructs are developed through principal components analysis, and the causal links among internal marketing, work group socialization, job satisfaction, organization commitment, customer orientation are exiled by structural equation model (SEM). Besides, Person correlation is also used. This study finds that internal marketing will positively indirectly influent customer orientation through work group socialation, job satisfaction, organization commitment. Besides, work group socialization has the stringest effect on customer orientation in our model. Becauce it directly influents customer orientation and directly influenced by internal marketing. Based on the result of this study, mangers who would like to enhance employees¡¦ customer orientation behaviors must pay more attenuation to informal marketing control.