In the mathematics and analysis of the higher mathematics , limit calculation is very important, for a variety of methods.L ＆#39;Hospital principle is one of the important methods. Based on the confucian classics section Paodingjieniu of Chuang-tzu, the paper expounds in detail how to utilize L＇Hospital principle for limit and the problems that should be paid attention to when using it, and the problems explained by the example.