To examine the effects of the heterotrophic nitrifiers on the yield and quality of fruit corn, as well as the content of soil available nutrients, Brevundimonas with high heterotrophic nitrification function was screened, and a greenhouse field experiment was conducted to investigate the effects of Brevundimonas on the biological characteristics, yield and quality of fruit corn and the possible mechanism of action. The results suggested Brevundimonas DB-4 with high heterotrophic nitrification was isolated, which could effectively increase the nitrification potential of organic fertilizers. Compared with CK (17.6 mg kg_-1^d_-1), the nitrification potential of DB-4 treatment (concentration 2×10₇^CFU.g_?1⁾was 23.8 mg kg_-1^d_-1^{, which was increased by 35.2%.}