The test result showed that:Different Nitrogen and Potassium ratio can improve the quality of apple-pear obviously, that different ratio of N.P.K., based on different nutrition contain of the apple-pear feild soil. It can improve the general contain of suger for 0.5%～5.6%, descend the contain of malata for 3.2%～6.5%, improve the rate of high grade fruit for 14.6%～45.2%.