At present, the characteristic of science and technology as the first productive force is increasingly obvious. The government science and technology plan is an important embodiment of the national science and technology development strategy, determining the direction of industrial development. Deepening the transformation of government functions and accelerating the reform of science and technology management put forward new and higher requirements for science and technology assessment. The implementation of government science and technology plan is characterized by transparency, diversity of value orientation and externality. Therefore, from the perspective of technology spillover effect of promotion programs in government science and technology plans, this paper constructs an evaluation model of technology spillover effect, and finally puts forward relevant suggestions from the perspective of spillover side, spillover path and spillover receiver.