Using hybrid indica rice IIyou 838 and hybrid japonica rice xinzajing 1 as experiment material, designing four transplanting densities of 300,000 holes/ hm2, 225,000 holes/hm2, 150,000 holes/hm2 and 75,000 holes/hm2, we studied the characters of panicle and its formation rules from tillers of the two combinations at different transplanting densities. The experiment indicated that, with density reducing, paddy rice's effective tillering time and the highest time correspondingly delayed, the panicle formation rate obviously enhanced by thinly plant cultivation, the effective ears from single plant had increased in a great degree. At the same time, the economical character of tiller to panicle at every stage had been optimized wholly with the planting density drop. each ear of number of seeds, each ear of solid number of seeds, a grain of density is increasing, mid and late part minute tiller to panicle in the output constitution proportion distinct enhancement, then proposed that thinly planting cultivation is advantageous in displays rice production potential and increase output for big ear and the strong tillering rice varieties.
