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