The effects of different maize sowing dates and densities on stem and leaf morphological characters and yield of soybean in wheat/maize/soybean relaycropping system were studied. The results showed that with early sowing of maize, the maize yield was promoted, and maize was harvested in advance, which reduced the intergrowth period with soybean and guaranteed soybean＇s proper plant height, larger stem diameter and optimal values of LAI and SLW, so that soybean yield was also increased. The effects of different maize densities on the stem and leaf of soybean mainly were significant before the maize harvest, but soybean yield under high maize density was significantly lower than that under middle and low maize density, and the highest maize yield was under middle density. Based on soybean and maize comprehensive values, the optimum combination of this experiment was sowed on March 21 and planting density was 5.25×10^4 plant/hm^2.
