The correlations of eight characters (yield per plant, etc) with each other and the genetic path coefficient of yield per plant through other characters were analysized. The results showed that genetic correlation of numbet of first branches and 100 seed weight with yield per plant is significantly positive. Also the enviornmental correlation of plant height and number of capsules of main spike with yield per plant is significantly positive. The helpful approach to increase yield per plant is to select castor varieties with more number of first branches, higher 100 seed weight and capsules of main spike when plant height and number of main stem node are relatively maintained stability.