The best combination of rapeseed sowing date，planting density and fertilizer amount level，correlation and path analysis between 8 agronomic traits and yield were studied in this experiment by ternary quadratic regression orthogonal composite design from 2010 to 2011.The results showed that plant height，the number of effective siliques per plant，seeds per silique，diameter of root stem，and the number of leaf scar showed a significant or extremely significant correlation with yield.The correlation coefficient of agronomic traits on yield was the number of effective siliques per plant(0.955 4)＞plant height(0.934 0)＞diameter of root stem(0910 7)＞seeds per siligue(0.910 6)＞the number of leaf scar(0.844 5)＞branch height(0.694 1)＞the number of branches(0.559 5)＞1 000 seed weight(0.229 2).The order of direct effect of agronomic traits on yield was the number of effective siliques per plant(0.881 1)＞diameter of root stem(-0.464 5)＞the number of leaf scar(0.335 0)＞plant height(0.290 8)＞the number of branches(-0.200 0)＞seeds per silique(0.085 7)＞branch height(0.073 2)＞1 000 seed weight(0.045 4).The number of leaf scar and diameter of root stem were important agronomic traits which affecting the yield in this experiment.The number of leaf scar will directly affect yield，while the diameter of root stem mainly increased yield by influencing of other agronomic traits.In the south paddy field area，rapeseed yield was significantly affected by sowing date，plant density and fertilizer amount.Under the experimental conditions，the combination of sowing date for Oct27th，planting density of not less than 450 000 plant/hm2 and the fertilizer amount for the 18519 kg/hm2 was the best planting program.