Open innovation has been a major trend under the background of globalization袁 which has much pro-found influence on the development of national innovation system ( NIS) . It is critically important for China to speed up the establishment of deeply integrated open innovation system袁 further implementing the innovation－driven development strategy and comprehensively deepening the institutional reform. China has experienced-from a closed production system to a market－oriented economy

as well as the transformation of NIS. 野Out-side－in冶

together with 野inside－out冶

have been the main two models of developing open innovation in past decades. However

the open level of national innovation system and the overall innovation efficiency is not high

and the main obstacles are institutional and policy - related. Therefore

it is suggested to enhance externalknowl-edge linkage and improve the internal efficiency of innovation system

with focusing on expanding talent flow and optimizing the institutional environment

which helps raise the depth of openness for NIS and actively integrate the global innovation network