An experiment was carried out by a split block design with two factors of compact com hybrids of XY335(high-plant), ZD958(medium-plant) and GY 1(short-plant) as main plot and planting densities of 45 000, 53 250, 61 500, 69 750 and 78 000 plarn/hm2、sub plot to describe the variation of population quality indices, such as yield and yield components, leaf area charges, dry matter accumulation and partitioning, sink source relation, and population uniformity, as affected by hybrid and planting density. It was shosvn that grain number per ear, unifomuty of plant height, dry matter per plant, ratio of seed- set, full degree of sink, grain leaf ratio and yield-leaf ratio arisen from variable coefficient of planting density treatments regularly declined with hybrid plant height reduction. During late grosving stage, change trends of reduction rate of leaf area, relative status and balance relation of source and sink induced by planting density treatments were also varied with the variation of hybrid plant height. High-plant hybrid was shown low for suitable planting density and harvest index, and its population quality was susceptible to planting derv ity increase, however, short plant hybrid was relatively susceptible to planting density with limited individual productivity. Medium plant hybrid was ideal hybrid type for more post silking dry matter accumulation when reasonable planting density sown, high in theoretical yield and adaptation to optimal planting density.
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