从南方7省引进的30个优良柚类品种（品系类型）在常德市进行评比试验，依据1991～1994年连续4年的产量，按照“经济林优良品种、类型选择标准”，超过参试均值30％以上、高于对照值50％以上者评为优良品种，评选出沙田柚和溪蜜柚2个适合本地发展的优良品种，其果实主要经济性状的遗体力分别在66．25％和62．19％以上，产量的遗传力分别为57．08％和53．24％，遗传增益分别为29．82％和32．31％。 Thirty fine grapefruit cultivars (line type) introduced from seven southern provinces were tested in Changde City. According to the output of four consecutive years from 1991 to 1994, the average value of the test varieties exceeded the test average of 30 % Above, 50% higher than the control value were rated as excellent varieties, selected Shatianyou pomelo and pomelo two suitable for local development of fine varieties, the fruit of the main economic traits of residual force at 66.25% and 62 respectively. 19%, the heritability of yield was 57.08% and 53.24% respectively, and the genetic gain was 29.82% and 32.31% respectively.