<FONT face=Verdana>Testing is necessary for the functional correctness

performance

and reliability.The BPMNbased composite services have large number of input parameters and the assigned values of individual parameters

the number of corresponding combinations of input parameters is huge.This paper described a new approach based on combinatorial designs to generate reduced test cases that detect the mutual effect of parameters and based on the method

designed and implemented the SOArTester system

which helps the processes of test cases deployment

execution and monitoring

and the number of test cases generated grows logarithmically in the number of parameters.Experiments demonstrated that SOArTester enhanced the automation level of composite service testing

reduced the testing cost

and improved the efficiency of testing.