In this study，the dynamic characteristics of leaf area index(LAI)of maize under drip irrigation and different nitrogen application conditions and the effects of environmental factors such as temperature on the morphological structureand growth of maize in Ningxia irrigation area wereexplored，the dynamic changes of corn growth process and relative LAI were predicted. The experiment was conducted in Pingjibao Farm of Ningxia and Experimental Farm of Ningxia University in2017～ 2018. The Tianci19，which is mainly planted in the irrigationarea，was used as the test material. The water and fertilizer integrated management technology was used and six levels of nitrogen fertilizer were set up. The LAI and effectiveaccumulated temperature(GDD)were normalized from the seedling stage to the 30 days after silking. With relative GDD asthe independent variable and relativeLAI(RLAI)as the dependent variable，five simulation models with higher accuracywere obtained. The modely=(a+bx)/(1+cx+dx 2)was more consistent with the dynamic change of RLAI of maize with drip irrigation in Ningxia. The test results of the model showed that the accuracy was greater than 0.933**，and the accuracy R 2 was greater than 0.915**.Therefore，this model can accurately predict the RLAI of corn populations. The N application amountcan regulate theLAI，averageLAI(MLAI)and MLAI/LAI ofcorn，which provides an effective technical way for the in -max depth study of maize yield improvement.