The ground test for flammable liquid drainage of civil aircraft pylon is used to verify the flammable liquid drainage design scheme in the fire protection design, so as to show the compliance of CCAR 25. 863 and 25. 1182. This paper sorts out the general physical configuration check requirements of the test piece of the ground test method for flammable liquid drainage of pylon, analyzes the special physical configuration check requirements for the internal and external parts on the drainage path, and conducts the research on the development test method for confirming the special physical configuration check requirements. The requirements for the selection of test points are set, and it is suggested that the digital mockup space analysis and assembly simulation should be used in the process of test point planning to ensure that the operation of the approach method of test points is feasible. The ground test procedure for flammable liquid drainage of pylon was given, and the precautions for the inspection and collection of liquid after the completion of water injection and collection of discharge were analyzed, and the analysis method of the test results was introduced, so as to fully demonstrate the ground test method for flammable liquid drainage of civil aircraft pylon, which has certain guiding significance for the ground test method for flammable liquid drainage of civil aircraft pylon and the planning and implementation of the compliance test.