In this paper we review the human resources management outsourcing research in domestic and overseas, establish a model and then propose research hypotheses. With the empirical research method, we take the questionnaire investigation and research on enterprise human resources department manager or staff, and then take statistical analysis to them with SPSS software. From the research results, we come to a conclusion that top intervention, strategic position of the function and the asset specificity has more significant impact to enterprise human resources management outsourcing degree, thus, providing reference opinions for enterprise human resources outsourcing.