Using the sample of Chinese family firms listed in Small and Medium -sized Board and Second-board Market from 2007 to 2012,based on the SEW( Socioemotional Wealth)theory,we have researched the impact of the family involvement degree on the technical innovation,and the moderating effect of environment uncertainty on this kind of impacts. The results indicate that family involvement degree in ownership and governance have significant negative effect on the innovation input and output,but when the family firms are faced with more complex environment or more dynamic environment,this negative relat...