Abstract: Based on Chinese panel data of 27 provinces in high-tech industry over the period from 1999 to 2014, the paper studies the influence of technical activities, including independent innovation, simulating innovation and technology imitation, on TFP in the framework of technology learning curve with Spatial Durbin Model. And then the paper identifies the development phases of high-tech industry and spatial spillover of technical activities. The results show that independent innovation influences TFP with the inverted U-shaped curvilinear effects and simulating innovation influences TFP with the U-shaped curvilinear effects in high-tech industry. The effect of technology imitation is not significant. It means that the impetus of technology imitation on TFP has moderated or even vanishes. The effect of simulating innovation turns from non-significant to positive. The effect of independent innovation turns from positive to non-significant. And independent innovation has a greater impact on TFP than simulating innovation. Technological level is close to international advanced technique. In addition, innovation activities have the obvious spatial spillover effect and the spatial spillover effect is greater than intraregional direct effect.