With the fast development of both science&technology and supply chain management, supplier involvement in new product development (SINPD) has become an efficient way to improve the efficient or effectivity of new product development.

Supplier involvement in new product development (SINPD) can benefit the whole supply chain as a new mode of collaboration.

According to different level of supplier involvement, four levels of supplier involvement in knowledge innovation are constructed.

Then according to different levels of supplier involvement,four level of supplier involvement in knowledge innovation were constructed.

Based on the concepts and theories of supplier selection criteria,supplier involvement and guanxi in the context of Chinese culture,this paper explores the impact of Supplier selection criteria and supplier involvement on purchasing cost control with regression model on a sample of 120 firms.

An empirical study of early supplier involvement in new product development;

This paper illuminates classification of manufacturer s product innovation and advantages of supplier involvement, and according to product innovation stage, we divide supplier involvement into two models-supplier early involvement and supplier late involvement and analyses the impact of two types of supplier involvement model on product innovation.