Abstract: Objective]To explore bio -organic fertilizer on yield and quality of Korla Fragrant Pear through fertilization experiments.[Method]Representative tests were selected to carry out chemical fertilizer, biological organic fertilizer,chemical fertilizer and biological organic fertilizer mixed application and control treatments and then the results of experiments to explore influences of bio-organic fertilizer for Korla Fragrant Pear yield and quality were analyzed.[Result](1 )Compared with other fertilizer treatments,the highest yield of Korla Fragrant Pear was that by bio-organic fertilizer treatment.(2)On the grade of Korla Fragrant Pear, the yield of the first grade pear was the highest under the mixed fertilization of chemical fertilizer and biological organic fertilizer,which showed a very significant difference (P<0.01 ).Chemical fertilizer was the best treatment on the second grade of the pear.There was no big difference between each treatment on the yield of third grade pear and fourth grade pear.(3 )Compared to the control treatment,Korla Fragrant Pear fruit weight was improved under different fertilization treatments,and fruit shape index was affected little by differ-ent fertilizer treatments,soluble sugar content was increased to varying degrees compared with the control treatment.The soluble sugar was increased higher in bio -organic fertilizer and mixed fertilizer processing, which was increased by 15.58; and 17.75;,respectively.The titratable acid content decreased to varying degrees,with a minimum of 0.61 g /kg,and compared to the control treatment,bio-organic fertilizer and chemical fertilizer mixed fertilizer treatment process was the largest,which was decreased by 14.29;.The vi-tamin C content of fruit was increased 11.16;,15.18;,13.84;,among which,the treatment effect of bi-ological organic fertilizer was the best.[Conclusion]The application of bio-organic fertilizer can increase the yield of Korla Fragrant Pear and promote the quality of the fruit.