In order to have a core competitive advantage and achieve sustainable development, high-tech companies need to improve the technological innovation capability constantly. By using multi index comprehensive evaluation method to the evaluation of technical innovation ability of 374 high-tech enterprises of Fengtai science and Technology Park. Firstly, based on analyzing the influence factors of enterprise's technological innovation, using dimensionless mean objective weighting method deal with the quantification of indicators and the standard deviation method deal with empower each index weight. Secondly, based on the analysis of enterprise technology innovation factors, this paper established an evaluation index system of technological innovation capability of high-tech enterprises, and analyzed the various indicators' weight and the technological innovation capability of high-tech enterprises in different areas in detail. Finally, based on the empirical analysis of the related conclusion for the enterprise management to improve management, improve enterprise core competitiveness to provide decision basis.