In order to obtain new varieties of Tagetes erecta with intellectual property and high ornamental values, selective breeding and hybridization of Tagetes erecta have been conducted for 10 years successively. The main achievements are as follows:1. Male sterility of Tagetes erecta was discovered. 3 male sterility lines, 16 inbred lines and 6 optimal hybridization combinations (including 4 yellow combinations and 2 orange combinations) were obtained through intra-specific hybridization, and 2 optimal triploi...