Eighty-eight and one hundred and twenty-two conventional indica rice cultivars were solution-cultured in 2001 and 2002, respectively. Leaf area index (LAI), dry matter weight (including root, culm and sheath, leaves, panicle), nitrogen content in different organs, yield and its components were measured respectively. The tested rice cultivars were classified into 6 types (i.e. A, B, C, D, E and F, A was the lowest, and F was the highest) based on their sink potential level by the MinSSw method, to study their difference in source and sink. Results were as follows: (1) Difference in sink potential (SP) of the cultivars used in this study was very large, the averages of SP in types of A, B, C, D, E, F were 426.37, 642.53,770.96, 903.73, 1 064.32, 1 213.90 g m-2 in 2001, and 359.36, 574.11, 764.98, 962.43, 1 200.11, 1 455.59 g m-2in 2002, respectively. (2) SP was significantly influenced by growth duration and SP per day, and the effect of SP per day on SP was more important than that of growth duration. (3) LAI at heading and maturing stage, green leaf weight at heading and maturing stage, leaf weight per unit leaf area in large SP type of indica rice were higher than those in small SP type, while the decline proportion of LAI during grain filling period. (4) Varieties with large SP showed higher net assimilation rate and higher values in grain yield per unit leaf area, SP per unit leaf area, SP per unit dry matter weight and SP per unit N at heading stage. (5)Multiple stepwise regression analysis indicated that SP was significantly influenced by green leaf weight at heading stage, SP per unit leaf area, SP per unit N, SP per unit dry matter weight, net assimilation rate during grain filling period and leaf weight per unit leaf area, with the determination coefficient ranging from 0.953 to 0.963. Path analysis showed that effects of green leaf weight at heading stage and SP per unit leaf area on SP were larger than those of SP per unit N, and SP per unit dry matter weight, net assimilation rate during grain filling period, and leaf weight per unit leaf area.