Abstract. With the deepening of social network research, network diversity has been paid more and more attention. Based on the current background of China, this paper uses the main theories and methods of social network research to explore the impact of the diversity of small enterprises' social network on innovation performance in China. First of all, analyzes the main status of cooperation of small enterprises and their social network from the inter-organizational interaction level; On this basis, put forward the hypothesis model of " social network diversity of small enterprise negatively impact on innovation performance and technological environment turbulence play a regulatory role between them" from the network level; Finally, the use of SPSS and AMOS software for empirical testing, there are two main conclusions to be drew, that social network diversity of small enterprise has a negative impact on innovation performance, and technical environment turbulence weakened such a negative impact. Literature Review Network Diversity"Network" initially originated in the field of sociology, Brass et al. defined it as a collection of nodes and a collection of representing some kind of relationships between the nodes. With the application and development of social networks, there are a series of theories to be produced, such as Weak Joint Advantage Theory [19], Mosaic Theory[20]and Structural Hole Theory [21], are used to explain the network phenomenon. Many scholars, from the "strong and weak relationship" or "structural hole" angle, analysis of the enterprise social network, Academia known as "the dispute between strong and weak relationship" and "the dispute of structural hole ", However, relative to the strong and weak relationships and structural holes, the study of network diversity is still inadequate, although the network diversity is also an important dimension of the network.According to the scholars' research, the nature of network diversity can be divided into five types: differences in technology, differences in resources and knowledge, differences in the combination of upstream and downstream industry chains, differences in partner complementarity and a combination of four differences above. In this study, the viewpoints of the majority of scholars will define the network diversity as the relative difference between the network members, which is mainly reflected in the degree of differentiation of the network subject in resources, ability, knowledge and technology. Network diversity, as one of the most important features of the network, is an emerging concept. Innovation PerformanceThere are two opposing views on the relationship between network diversity and innovation performance.A view is that network diversity is conducive to innovation: Reagans &Zuckerman[22]studies show that network diversity has a search advantage, although network diversity has a negative impact on network density, network strength and network coordination, the diversity increases diversity of perspectives and ideas, and thus en...