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1990～1994年，以两个低温敏感型甘蓝型油菜细胞质雄性不育系为材料，探讨了提高制种杂交率的途径。结果表明：（1）在平丘区秋播制种条件下，不育系的不育度在70％以下，平均制种杂交率为62．0％，在自然生态条件下，难以筛选到秋播制种的适宜区域。（2）采用平丘区晚直播制种途径，不育系的不育度可提高到90％以上，但制种亲本个体发育不良，综合性状差，制种产量受影响。（3）高海拔区（2600～3200m）春播制种途径，其制种杂交率达93．0％以上，两年制种产量达到607．5～1939．5kg／hm2，平均1298．3kg／hm2，超过平丘区秋制水平。
From 1990 to 1994, two cold-sensitive Brassica napus cytoplasmic male sterile lines were used as materials to explore the ways to improve the hybridization rate of seed production. The results showed that: (1) Under the conditions of autumn sowing in Pingqiu district, the sterility of sterile lines was below 70% and the average hybrid rate was 62.0%. Under natural ecological conditions, it was difficult to screen autumn sowing The appropriate area for seed production. (2) By late sowing direct seeding method in Pingqiu district, the sterility of male sterile lines can be increased to more than 90%. However, the individuals of seedling parents are poorly developed, the comprehensive characters are poor and the seed yield is affected. (3) In the high-altitude area (2600 ~ 3200m), the hybridization rate was 93.0%, the yield of two-year seed production reached 607.5 ~ 1939.5kg / hm2 with an average of 1298.3kg / hm2 , More than Pingqiu area autumn level.