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In order to analyze the influence of the structural parameters of the wind tunnel on the stability of the generated wind field, based on the existing low-speed wind tunnel, establish multiple test models with different parameters by changing the structural parameters of the test section；Ansys CFD is used to simulate the structure of multiple new models, and the simulation results are fitted to the simulation results to find out the influence of the changes in the structure parameters of the wind tunnel contraction section on the axial wind speed gradient and the normal wind speed uniformity；The simulation experiment results show that the uniformity coefficient of the effective test area of the normal center plane of the test section decreases with the increase of the length of the contraction section, and stabilizes to a certain extent. The wind tunnel model has a basic uniformity coefficient of the wind field after L>23cm Isstable, After the wind tunnel model L>23cm, the wind field uniformity coefficient is basically stable. Theaxial gradient of wind speed in the first half of the test section is obviously greater than that in the second half. The effective test area is mostly concentrated in the second half. The wind tunnel model The effective test area of the central axis x>(10～15)cm can provide a reliable reference for wind tunnel design。