We designed a device based on FPGA and FT245 for testing chips. Regard FPGA as the control core unit of the testing system. Use FT245 to achieve communications between FPGA and PC . PC sends down the test codes and then collects and analyses the output response datum. We can get the conclusion by comparing the collected datum from PC with theoretically correct datum. For analog chips, We designed the A/D and D/A conversion control modules. Eventually we have completed the real test and the whole task.