Abstract: Through the quadratic general rotary unitized design to study the high-yield cultivation mode of giant rice Fengchao No.6,two controllable factors of cultivation density and row spacing was selected, and the temperature and light difference in the field was recorded. Analyzing the mathematical model between actual yield and two factors, it is concluded that the two-factor level configuration with a yield of more than 9 000 kg/hm² is cultivation density 86 064~92 880 plants/hm², row spacing 43.94~50.78 cm.

Key words: giant rice, cultivation density, row spacing, yield