Abstract: The results of varicance analysis on genetic parameters (genetic correlation,genetic gain and selection index) in rape showed that correlation between some main characters such as numbers of the first order effective branches,effective pods per plant,seed numbers per pod and seed weight per plant and seed oil bearing were positive,while correlation between 1000 seed weight and seed oil bearing was negative.Furthermore all these characters had a great correlated genetic gain (CGS) to seed oil bearing rate;Index selection had an advantage over direct selection and correlative selection;The selection index which consisted of the first order effective branches numbers,the effective pods numbers per plant,1000-seed weight and seed weight per plant had the best effect on selecting oil bearing rate.