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The evaluation of software quality is a nodus of software engineering. To explore the scientific software quality evaluation method and realize computerized, provides a data basis for software quality managers in decision-making,and also offers an objective comparison basis for customers when they choose the software.Considering the complexity of software quality evaluation index, on the basis of comprehensive analysis of the indicators of the software quality evaluation, the software quality evaluation method based on extension theory was proposed and the software quality evaluation system was designed by using C++ based on extension theory. Firstly, the software quality evaluation system was established, and we could got each index score data through expert scoring. Secondly, the extension matter-element model was established according to the established evaluation index system. Thirdly, the correlation were calculated by using the data and weights, and we could get the values and could automatic analysis them. At last, the software quality evaluation conclusion was obtained, and the reports are printed. After testing, the system were fast, accurate and with good usability.