Abstract: In this study,we chose Sudan grass and sweet sorghum to hybridize with Sorghum male sterile lines,to select advanced interspecific combinations.There are 15 kinds of male parent materials,to avert the blindness of follow-up crossbreeding,make it more pertinent,we firstly chose fifteen male parents through eight agronomic characters index and two production index to minimise workload,meanwhile,to Provide theoretical basis for breeding high green forage yield,high seed yield and moderate sugar content in future.Finally,we selected 7 kinds of materials as the male parents：W010,T03, N0601,06-071 （5）, DxK, BS（1） B9@.Among all these materials,under the same planting destiny, the seed yield of BS（1） is high,while the green forage yield is lower than the others;Relatively,the seed yield of DxK is the lowest,then the green forage yield is high;The seed yield of the five remaining materials is high,so is the green forage yield,all of them is good male parent materials.