Low nitrogen use efficiency is an important restricting factor for efficient and stable development of maize industry in the black soil area of Northeast China. The stable liquid nitrogen fertilizer was prepared with urea ammonium nitrate solution(UAN)and nitrification inhibitor 2-Chloro-6(Trichloromethyl)pyridine microcapsule(CPCS)as material to study its effects on nitrogen absorption，utilization，growth of maize in the black soil area. Three kinds of stable liquid nitrogen fertilizers，0.5%CPCS-UAN，1%CPCS-UAN and 2%CPCS-UAN，were prepared with 2-Chloro-6(Trichloromethyl)pyridine traditional emulsifiable concentrate(CPEC)as the control. Six treatments were set up in the field experiment:no nitrogen fertilizer(N0)，UAN(N180)，1%CPEC-UAN(N180)，0.5%CPCS-UAN(N180)，1%CPCS-UAN(N180)and 2%CPCS-UAN(N180). The dynamic changes of soil inorganic nitrogen and plant nitrogen absorption were measured during the growth period of spring maize，and the yield and its components were measured at the maturity period of maize. The results of the field experiments in 2020 and 2021 showed that CPCS-UAN treatments significantly improved maize yield and plant nitrogen uptake. Among them，1%CPCS-UAN treatment was the best，with maize yield and nitrogen uptake increasing by 6.38%-8.35% and 24.12-31.70 kg/hm² compared with UAN treatment，and by 5.39%-6.30% and 17.51-18.98 kg/hm² compared with 1%CPEC-UAN，respectively. The main reason for the yield increase of CPCS-UAN was the increase of grain number per panicle and 100 grain weight. In the whole growth period of maize，NH4＋-N and NO^3--N in 0-20 cm soil with CPCS-UAN showed a gradually decreasing trend，and the content of NH4＋-N in the soil was higher than that of other treatments in each growth period. CPCS-UAN significantly reduced the apparent loss rate of nitrogen and increased the apparent utilization rate of nitrogen fertilizer. Among them，the apparent loss rate of soil nitrogen with 1%CPCS-UAN was the lowest(33.2%-34.0%)，and the apparent utilization rate of nitrogen is the highest(40.9%-49.6%). In black soil，CPCS-UAN can effectively inhibit the transformation from NH4＋-N to NO^3--N，reduce nitrogen loss，increase nitrogen absorption of maize，improve nitrogen use efficiency and increase maize yield.