Based on the development of previous results, strictly following the qualitative research process, this paper does the "from the ground" research of 5 enterprises in the mature stage in traditional industries of Hebei province in China by the normative multi-cases study method. With applying interface management theory, it addresses the interface between strategic intrapreneurship and functional HRM, so as to analyze its operation state, puts forward operational conceptions of the driving force and the binding force, and establishes the coupling matrix and quadrant criteria. All of these, enrich and deepen the existing theoretical framework and management implications. Meanwhile, it provides the inspiration for the practice to judge the mature state, carries on interface intervention, in order to achieve the mature stage updating many times.