Abstract: Take potato variety Kexin 1# as the experimental material, processing the leaching of calcium by 0.5% and 1.0% Ca(NO3)2 after picking, to analysis the effect on the cell relative membrane and POD activity. The results show that: Calcium treatment may reduce the relative conductivity and MDA content effectively, improve the POD activity, thereby to increase the storability of the potato tubers, and founded that the processing by 1.0%Ca(NO3)2 may obtain the best result.