Abstract: In order to verify the design results of a laminar flow wing, a high-speed wind tunnel test was carried out in the DNW-HST wind tunnel in the Netherlands, and the transition position of the boundary layer on the wing surface was measured by the TSP method in the test. The experimental results show that the TSP method is very effective in detecting the transition position of the natural laminar airfoil surface. At the same time, it is found that the test has high requirements on the surface finish of the wing, and the test results are very sensitive to the surface pollution of the wing.