To explore effects of different nitrogen-water treatments on growth and nitrogen utilization rate of dripirrigated coix in cold and arid regions of western Heilongjiang,the coix cultivar,Yiliao 5,was selected as the plant material.Using random group design and setting 4 nitrogen levels （N₀,N₁,N₂,N₃） and 4 irrigation quantities （W₁,W₂W₃,W₄）,the effects of different nitrogen-water treatments on the height,stem diameter,SPAD value,nitrogen utilization rate,thousands of grains and yield of coix were studied.The results showed that the amount of nitrogen application or irrigation alone has little effect on the growth and the nitrogen fertilizer utilization rate of coix,and the coupling of water and nitrogen within a certain range can exhibit positive interaction.The spike weight thousands of grains and yield of coix of W₂N₂separately were enhanced 14.92% and 13.04% with W₀N₀,the nitrogen recycle rate being enhanced 58.11%.Under drip irrigation coupled with film mulching,the optimal amount of irrigation for coix in western Heilongjiang was 673.08 m³/ha and the nitrogen application was 150 kg/ha.