The paper proposes the necessary that establishing interface between Commercial Aircraft Flight Test Control System (FTCS) and Flight Test Cooperation Platform (FTCP), considering the complex and variety of the flight test resource. With the help of FTCS's capability of processing and managing flight test information and through computer technology, FTCP interface realizes reading and downloading flight test data from FTCP when available test cards and test points exist. By means of the method referred in the paper, test data can be got completely and accurately. It is proved that flight test cost can be reduced, the workload can be decreased and the efficiency can be improved. Ultimately, all the advantages will lead to make flight test go more smoothly for civil aircraft.