Abstract: Software defects have propagation characteristics in the software development process．The propagation characteristics of the software defects make defects related,which are needed to be located and removed．Software defects associated analysis is of great significance for software defects removing,quality assurance,and process improvement．In this paper,the propagation process of software defects was analyzed,and the relationship between object association and object defect association was established based on object-oriented analysis and design model．A tree association rules and characteristics similarity association rules were presented based on the propagation process of software defects．The procedures to create these association rules were given and the steps to build up tree association and the characteristics similarity association were presented.

Key words: Software defect,Defect associated,Defect propagation,Defects removing