Abstract: For a long time, the technology gap of key products in equipment manufacturing industry represented by CNC machine tools is lack of quantitative measurement research, which makes it impossible to use objective characterization methods to measure and evaluate the technical development level of NC machine tools. In view of the above problems, an evaluation system for the technical gap of high-end CNC machine tools is constructed, starting from the four directions of common technology, typical host products, CNC system and key functional components, which are subdivided into the technical element items. A quantitative characterization method of the age gap between China's machine tool technology level and the International (regional) advanced level, is proposed. Evaluation models for the sub item technology level, common technology/product level evaluation model and product key technology are established based on fuzzy data processing. Finally, a large sample data survey is carried out based on the system, and a quantitative analysis of the age gap of machine tool technology is carried out based on the proposed evaluation models. Evaluation results can provide the important support for the government′s scientific decision-making and industry development planning.