Abstract: Excellent inbred lines were used as the basic material, and tropical or temperate materials were introduced to select a number of bicyclic lines for breeding. Excellent inbred lines were used to make a cross combination, from which new lines were selected. According to Griffing（1956） method 4-combination complete diallel crosses of 25×25 were obtained, and an annual 3-point test was conducted in the spring of 2016, a randomized block test was conducted in three counties of Guiyang, Guizhou Province. The results showed that among the 25 inbred lines, the positive general combining ability（GCA） of 13 inbred lines was the highest, QET（40.19）, and the other inbred lines（GCA） was negative, among which 107 C 171（-39.05） was the lowest, the highest special combining ability（SCA）LSJ 107×DK 171（171.99） was the highest, and LSJ 106×LSJ 107（-286.14） was the lowest. Combination LSJ 107×DK 171 had the highest yield（660.82 kg/667 m~2）, while combination LSJ 106×LSJ 107 had the lowest yield（212.7 kg/667 m~2）. The cross combinations Qiandan 26 and Qiandan 27 prepared by the selected inbred lines had been approved.