In the context of the spread of the global epidemic and economic downturn, promoting enterprises' scientific and technological strength and innovation ability is not only a practical need for building an innovative country but also a way to encourage the development of enterprises to maximize profits. This research focuses on the problems in the process of high-tech enterprises' technological innovation to improve enterprise performance under the conditions of government support. This study analyses the impact of government support on enterprise performance from two aspects: Government subsidies and policy orientation. This research uses the questionnaire method to explore the topic empirically. The research results show that, first, non-selective government subsidies and selective government subsidies are conducive to the improvement of the technological innovation level of enterprises; second, tax preference policies, government procurement policies, and financial support policies help to enhance the technological innovation capabilities of enterprises; third, the non-selective government subsidies and the selective government subsidies can jointly promote the performance of high-tech enterprises; fourth, building support based on diversified policies is the driving force to improve enterprise performance; fifth, technological innovation affects the high-quality development of high-tech enterprises; sixth, technological innovation affects the path of government subsidies to enhance enterprise performance; seventh, give play to the intermediary role of technological innovation in policy orientation to enhance enterprise performance. Given the above conclusions, this study provides specific suggestions for high-tech enterprises to improve their performance from the perspectives of government, industry and enterprises.