Abstract: By reason of the constant turnover of the software version as well as the ceaseless change of the source code,tester needs the regression test with a specific targeted direction. However, the current technical methods arc difficult in meeting such requirement. A method generating the test sets of regression test specifically based on the lines of the output code was proposed. I}he method classifies the test sets of regression test pertinently according to the execution path of each test case. The selection of the test case into the test subset will be made only if the case passes through the selected lines of the output code. Our method roundly takes the output functional properties of code lines into consideration which makes it applicable for obtaining the test sets whit certain pertinence in small block of code. Furthermore,this paper made the application of the method into the generation of the regression test sets based on the user rectuiremenu. Some examples show that the selection of regression test sets for modified code through this method can be both efficient and comprehensive, which enables it to suffice the regression test with stringent demand and provide test with expansibility.

Key words: Regression test,Lines of code,Select test subset, Lest requirement