In order to prove nitrogen,phosphorus and potassium fertilizer optimum ratio and fertilization level of the super rice variety Longjing 21 and conventional variety Longjing 29 which had larger extension area in Heilongjiang Province,to establish rice fertilization model and provide technical support for further promotion of high-yielding varieties.In this study,the "3414" fertilizer effect test was performed on two varieties.The results showed that there was very significant regression relationship between rice yield and application amount of nitrogen,phosphorus,and potassium fertilizer,and nitrogen was the most important factor for affecting rice yield.The sequence of the effects of nitrogen,phosphorus,and potassium on the yield increase effect:the super rice variety Longjing 21 was nitrogen＞potassium＞phosphorus,and the conventional rice variety Longjing 29 was nitrogen＞phosphorus＞potassium,excessive application of nitrogen,phosphorus,and potassium fertilizer would decrease the effect of increasing the yield of rice,thereby reduced fertilizer utilization.The optimal fertilization rate of conventional variety Longjing 29 was:N 149.7kg/ha,P₂O₅ 61.1 kg/ha,K₂O 62.1 kg/ha,N:P:K was 2.45:1:1.05,and the optimal economic yield was 9577.5 kg/ha.The optimal fertilization rate of the super rice variety Longjing 21 was:N 161.9 kg/ha,P₂O₅ 63.5 kg/ha,K₂O 83.6kg/ha,N:P:K was 2.55:1:1.32,the optimal economic yield was 9489.0 kg/ha.The increase of nitrogen application could increase the number of ears per ear and the number of ears per square meter,but reduce the seed setting rate and thousand-grain weight,there were differences between varieties.The increase of potassium application had the effect of increasing the number of ears and ears per square meter,paying attention to the application of potassium fertilizer when planting.The optimized fertilization scheme established in this experiment could be used as reference and adjusted the specific conditions of different accumulated temperature zones,to achieve rice high yield and efficiency.