In order to prevent excessive splashing from entering into the engine inlet, in the ARJ 21-700 aircraft, there is placed additionally between the wheels of main landing gear a water baffle, effectively improving the operation capacity of complex weather such as rain and snow. Difficulties being in existence in the flight test of water baffle strength verification-the selection of refitting position of the strain sensor and the design of test points，firstly, a splash load model is established by analyzing the splash mechanism of the aircraft wheel. Secondly, with the help of finite element analysis，the stress distribution of water baffle is determined and the strength check work is completed. According to the results of finite element analysis，the selection of refitting position of the strain sensor and the design of test points are completed. Finally, the work of water baffle strength verification is completed through flight test. The results show that the installation of water baffles can effectively change the splash pattern. The results of finite element analysis and flight test are in good agreement，which can provide useful reference for other similar complex irregular structures. The safety margin of water baffle is sufficient，and there is a large space for weight reduction，which requires further optimization of the design.