Abstract: The drag coefficient of the concave type low wind-pressure conductor is changed by the depth of concave of outer single wire in this study. The wind tunnel test was carried out by designing model conductor with different concave depths to obtain the conductor structure parameters of the optimal drag coefficient, and then the real conductor was produced to verify the drag coefficient. Taking low wind-pressure conductor with the same diameter of JL/G1A-630/45 as an example, the concave depth that meets the requirement of the drag coefficient of the low wind-pressure conductor was obtained. The wind tunnel test results of the model conductor are consistent with the real conductor.