Through single factor randomized block design,field experiment was conducted to study the influence of PGPR biofertilizer on the yield of potato and the nutrients(nitrogen,phosphorus,potassium)of potato in the Suizhong county of Huludao city,Liaoning province.The results showed that,the application of PGPR biofertilizer,potassium absorption rate of the underground part of the tuber was higher 998% than the conventional fertilization treatment,nitrogen absorption rate was higher than 1961% than the conventional fertilization treatment,phosphorus absorption rate was higher 201% than the conventional fertilization treatment.The results showed that PGPR biofertilizer could increase potato yield by 124% compared with the conventional fertilization treatment,significantly improve the utilization rate of fertilizer.Fully proved,it is feasible to improve the yield of potato in the application of biological fertilizer conditions.