The invention provides a heat-treatment process for enhancing offset yield strength Rp 0.02, which can effectively enhance the offset yield strength Rp 0.02 of a blade so as to enhance the whole fatigue resistance of a blade and prolong the service life of the blade. The process comprises the following steps: putting the blade into an annealing charging basket; then, putting the blade into a heat-treatment annealing furnace for annealing treatment; and finally, taking out and putting the blade into flowing or dead air for cooling. The process is characterized in that the annealing temperaturefor the blade is 400-600 DGE C, the annealing holding time is 1-6 hours, the cooling speed is 10-50DGE C/hour, and the discharge air-cooling temperature of the blade is adjusted to be 200-500 DGE C.