Under the environmental condition and management level of this experiment, the effects of cuttingheight . seeding rate, cutting frequency and nitrogen fertilizing amount on grass density of sportfield turfwere sludied by the method of FOUR FACTOR STURATED-THE BEST DESIGN. The results showedthat the optimum levels of the four factors affecting density of sportfield turf was 4. 5cm , 15g/m2 , stimes/month and 6. 78g/m2 respectively. And mathematical models of the significant correlations between thefour facto...