Abstract: Integrating test information by using U2TP in system modeling stage,on the one hand,enables system deve-lopers to obtain the overall concept of testing in early system modeling stage,on the other hand,can limit the number of test cases from the initial stage．TTCN-3has a perfect,mature test platform,therefore,so we make TTCN-3as the transformation target test language of U2TP．An automatic transformation system that transformed U2TP test model into TTCN-3ATS can reduce the amount of code in the test development at a certain degree．The core part describes the design and realization work of U2TP to TTCN-3automatic transformation．The end of this paper validates the transformation system through a concrete example of U2TP,and makes concrete analysis of the generated TTCN-3ATS.

Key words: U2TP,TTCN-3,ATS,Automatic transformation