In order to solve the problem that the dynamic measurement of non-uniform deformation of aircraft door gap is difficult and requires high accuracy under complex test environment, a measurement method of aircraft door gap was proposed based on surface structured light, and the measurement method of fringe projection structural surface was studied, including searching the stereo correspondence and absolute fringe order of each effective pixel in the wrapped phase image without spatial phase unwrapping process or any prior information, generate initial disparity map and absolute phase map and optimize disparity. The 3D structured light model was established, and the 3D coordinates were calculated using the parallax map and the absolute phase map. Process the obtained data, including establishing the physical coordinate system of the tested object, capturing the surface, and extracting the gap displacement. Two standard gaps were designed to verify the rationality and effectiveness of the proposed method. It can quickly and accurately measure gaps and step difference on any surface and dynamic scene. This method is applied to measure the deformation of a certain aircraft cabin door gap, and the actual deformation displacement was obtained.