Abstract: In this study, 107 crosses were made using 9 Yugoslavia maize inbred lines as female and 11 parent lines of 8 Chinese elite hybrids, belonging to different heterotic groups, as male. Through Dudley’s method the genetic potentiality of 9 Yugoslavia maize inbred lines were analyzed for the improvement in the yield of 8 Chinese elite hybrids and main ear –kernel characters，and for their proper applications. The results showed that the introduced Yugoslavia inbreds had broad genetic basis and high breeding value in indirect utilization. Almost all Yugoslavia inbreds, including 9801、9802、9803、9805、9807、9808 and 9809, could improve the yield of Yuyu15, GailiangYuyu20, Yuyu22,Yuyu23, Yuyu24, Shendn10 and Nongda108 through different parents and ear-kernel characters, while the real improving effects should be proved in further practical breeding.