The relations between densities of crop and yield or main physio1ogcal index of different types of corn variety were studied by using the split plot design under condition of enough fertilizer and water．The yield of compact type corn variety Zhendan 958 was much higher than loosely type corn variety Yuyu 25.The influences density on yield of interaction between density and variety reached significant level. When Zhengdan 958 and Yuyu 25 had density of 90000 plants/hm2 and 45000plants/hm2, they got highest yield. At same time, the leaf area coefficient, dry matter accumulation and economic coefficient of compact type corn variety is bigger than loosely type corn variety.
