From the view of methodology for genetic improvement ofJaponicacytoplasmic male sterile(CMS) lines,we introduced the breeding process of the dwarf-abortive type(DA type)JaponicaCMS line Chunjiang 95A with wide compatibility,and further investigated the biological characteristics of the DA type Chunjiang 95A and its isonuclear alloplasmic CMS line Dian-I type Chunjiang 95A.The results show that DA type Chunjiang 95A is a japonicalinous CMS line and mainly typical abortive,which is better in fertility stability than stained abortive typeJaponica CMS lines.The DA type Chunjiang 95A is featured with high stigma exsertion,good flowering habit,high outcrossing rate and wide compatibility.Its recoverability differs from stained abortive typeJaponicaCMS lines.Moreover,we discussed genetic improvement of the typical abortive type JaponicaCMS lines and the application prospects of heterosis. From the view of methodology for genetic improvement of Japonicacytoplasmic male sterile (CMS) lines, we introduced the breeding process of the dwarf-abortive type (DA type) JaponicaCMS line Chunjiang 95A with wide compatibility, and further investigated the biological characteristics of the DA type Chunjiang 95A and its isonuclear alloplasmic CMS line Dian-I type Chunjiang 95A. The results show that DA type Chunjiang 95A is a japonicalinous CMS line and mainly typical abortive, which is better in fertility stability than stained abortive type Japonica CMS lines. DA type Chunjiang 95A is featured with high stigma exsertion, good flowering habit, high outcrossing rate and wide compatibility. It recoverability is different from stained abortive type Japonica CMS lines. Moreover, we discussed genetic improvement of the typical abortive type Japonica CMS lines and the application prospects of heterosis.