Inverse analysis of the historical context in which Qian Xuesen (H.S.Tsien) proposed idea of technological science was performed. The difference between technology based on experience and technology based on science were first introduced. And then the idea of technological science proposed by Qian Xuesen was introduced logically. The talent training mode based on such a philosophy of technological science is inspiring,especially for mechanics teaching. An in-depth interpretation was offered by combining with examples.