Abstract: The optimal technological parameters and the prescription of the Paste-boronizing for steel is obtained by orthogonal experimental design.The influence of different heat treatment processes after paste-boronizing on the structure and the performance of steel 45 and T10 is investigated.The result shows that the thickness of the boronized-layer is higher than 110μm and the micro-hardness is higher than 1130HV for steel 45, and the thickness of the boronized-layer is higher than 60μm and the micro-hardness is higher than 1360HV for steel T10.There is no effect on the micro-hardness and the thickness of boronized-layer by the heat treatment, but it can affect the structure and performance of substrate significantly.The tempered-martensite of the substrate can be obtained through the process of quenching and low tempreture tempering after paste-boronizing, the micro-hardness of the substrate was enhanced, then the difference of the hardness between substrate and boronized-layer was reduced and the sustaining ability of the substrate for boronized-layer was improved.