The rebound method may be used to detect the intensity of the concrete. But there would have wrong judgment when using the rebound method to detect the intensity of the moist or water-immerged concrete, because the compressive strength of the surface of the moist or water-immerged concrete is always influenced and debased. The result of the rebound method detection on the moist or water-immerged concrete compressive strength must be corrected. Firstly, the detection data getting from the present detection of the wet and dry concrete of the same grade are analyzed using the duality contrast regression. Then the influence of the moist or water-immerged concrete compressive strength on the intensity detection of the rebound method is get. Finally, the intensity curve equation of the rebound method that can meet the demands of the precision on the moist concrete is established, and the concrete compressive strength is reflected completely.