Abstract: In order to promote the application of excellent silage maize inbred lines,this article briefly introduced the breeding process,main characteristics and application of T08.Silage maize inbred line T08 was bred from the U.S.maize hybrid PN78599,which was bred through ⁶⁰Co-γirradiation combined with conventional breeding techniques by Pratacultural Sciences Institute of Heilongjiang Academy of Agricultural Sciences.T08 had good characteristics of high general combining ability,high biomass yield,strong stress-resistance and well stay-green trait.Two silage maize hybrid varieties named Longyu 15 and Longyu 17 were bred by utilizing T08 as the fermale parent.These varieties had been widely applied in the production.Several new silage maize varieties combined by T08 improved line had good performance in different area tests.