１９９５～１９９７年用３个蚕豆品种测定自然异交率，测定结果是：（１）以纯白花的白花株品种作母本，紫花品种通研１号为父本，自然异交率为２３３４％；（２）以无色种脐的１８６品种作母本，黑色种脐的通研１号为父本，自然异交率为２８６１％；（３）以无色种脐的南通三白品种作母本，黑色种脐的通研１号为父本，自然异交率为２８１６％；（４）以南通三白种皮色作指示标记测定，自然异交率为６３０％～７４７％，与历年测定结果不符，可见种皮色为过渡色，不适宜作指示标记。无色脐和白花两种指示标记，测定结果相近，与前人测定结果相符，结果可靠。 The results showed that: (1) The natural outcrossing rate was 2334 (P <0.05) with the white flower variety as the female parent and the purple flower variety Tongyan No.1 as the male parent. %; (2) Using 186 varieties of colorless umbilical as the female parent, Tongyan 1 of black umbilical was the male parent, the natural rate of outgrowth was 2861%; (3) The natural rate of outcrossing was 2816%. (4) The rate of natural outgrowth was determined by the index of Nantong three white coat color. 30% ~ 747%, inconsistent with the measured results over the years, showing that the seed coat color is transitional color, not suitable for indication. Colorless umbilical and white flowers two kinds of indicators, the determination results are similar, consistent with the previous determination results, the results are reliable.