In order to investigate the effects of polyurea formaldehyde slow-release fertilizer(PF) reduction application and deep tillage on wheat and maize yield，nitrogen fertilizer utilization efficiency and mineral nutrient migration，five treatments were set up:control(CK)，urea+rotary tillage(OPTX)，urea+deep tillage(OPTS)，PF+rotary tillage(PFX) and PF+deep tillage(PFS).A large-scale experiment was conducted on wheat and maize fields in lime concretion black soils in southern Henan. The results showed that compared with traditional urea(OPT) treatment，the yield of wheat and maize under PF treatment was significantly higher than that under OPT treatment，especially the yield of wheat and maize under PFS treatment was 12% and 6.4% higher than that under OPTX treatment，3.4% and 1.8% higher than that under OPTS treatment，respectively. Unlike yield，PFS treatment only showed higher nitrogen fertilizer utilization efficiency(NUE) in the maize season compared to OPTX and OPTS treatments，while NUE in the wheat season was even lower than that under OPTS treatment，which may be related to the slow nutrient release rate of PF under deep tillage conditions in the wheat season. Comparing the two cultivation methods，it was found that there was no significant difference in wheat yield between PFS and PFX treatment，while maize yield was significantly higher than PFX treatment；Different from the yield，the NUE of the wheat season treated with PFS was significantly lower than that of the PFX treatment，while there was no significant difference in the maize season，which may be related to the more suitable meteorology of the maize season and the subsequent release of PF nutrients in the wheat season. Comparing the residual amounts of ammonium nitrogen(NH4+-N)，nitratenitrogen(NO^3--N)，and total nitrogen(TN) concentration in the soil，it was found that after crop harvest，there was no significant difference in the residual amounts of NH4+-N in the 0 ～ 30 and 30 ～ 60 cm soil layers treated with PFS，compared to PFX treatment；the residual amounts of NO^3--N were significantly lower than that under PFX treatment，while the total nitrogen content was slightly higher than that under PFX treatment. This may be completely related to the incomplete release of nitrogen in PF under deep tillage conditions in the first season. In summary，based on crop yield and nitrogen fertilizer utilization efficiency，polyurea formaldehyde slow-release fertilizer shows higher yield benefits and potential for yield increase under deep tillage conditions，especially with significant improvements in nitrogen uptake，yield and NUE of maize crops，which is worthy of recommendation.