Abstract: Software testing scheme has the important influence with reliability and efficiency of software testing. Testing scheme can be selected according to the assessment of software testing quality. This paper mainly discusses the feasibility of fuzzy theory on assessing software testing quality. The concept of software testing quality indicator system and a method for assessing software testing quality, namely assessment method based on fuzzy partial ordering relation are provided. The advantages and drawbacks of this method and its application conditions are analyzed. By the calculation results of actual examples, the availability of the method is verified on the aspect of assessing software testing quality.