| The software is such an important resource than its qualities affect the users' performance. As the large numbers of software corporations boom, the software qualities more and more arouse extensive concern. A essential aspect of software quantity study is to provide and supervise the state of software qualities. The many foreign software corporations attribute their success to CMM or ISO9001 which attachs great importance to software process improvement. By applying the principle of statistical process control to software process improvement, the paper studies particularly how to analyse and control software process with the Shewhart chart in order to improve the capability of software process and enhance the competition power of software corporations.Firstly, the paper introduces the basical structure and principle of the Shewhart chart, analyses the current inland and overseas primary situation of software process improvement and anatomies the necessity of software process improvement. Secondly, the scheme of software measuring is worked out, which ensures the questions of software process to be diagnosed correctly. Thirdly, by analysing and processing the datum which have been collected for software process improvement with the traditional Shewhart chart, the laws which the datum imply would be revealed so as to determine the factors which effect on software process improvement and the direction for the improvement of software quality. Next, by analysing and controlling software process by the Shewhart chart with control lines, the fluctuation law of software process would be detected and the causes of process which is out of control would be found out so as to ensure that software process has constantly been under control. Finally, because of the defect that it hasn't the time span, the traditional Shewhart chart is improved by introducing weighted move average, In addition, the framework of implementation procedure of statistical process control is brought forward in the paper.
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