The predecessor of Lezhi Middle School was "Yang Le Academy" built in Chongzhen period of Ming Dynasty, with a history of more than 300 years. If it was named "Lezhi County Junior Middle School" from 1927 (the school is located in Dayu Palace, Zhengnan Street), it has a history of nearly 80 years. 1946 was renamed as "Lezhi County Middle School". 1950 after the county people's government took over, it was renamed as "Sichuan Lezhi Middle School" and the school site was in "Yingchunping" (current site). In this long course of running a school, the ancestors of Lezhi Middle School, rooted in the unique humanistic spirit and historical and cultural atmosphere, inherited and carried forward this spirit.

In the long history of running a school, Lezhi Middle School has inherited and carried forward the school-running concept of "being brave and sincere, being talented", emphasizing "taking the classroom as the center and implementing differential education; With mathematics as the leading factor, we should cultivate scientific thinking, adhere to the training goal of "cultivating comprehensive quality and developing individual specialties" in the process of comprehensively implementing quality education, strive to cultivate students' innovative spirit and practical ability, and improve their scientific quality. The school insists on scientific and technological innovation as the breakthrough point, so that students can learn the experience of scientific inquiry, master scientific knowledge and methods, and cultivate scientific thoughts and spirit in their growth and progress.

The school has made outstanding achievements in running schools. In the past 80 years, it has trained nearly 20,000 students for the country. A number of high-level and sophisticated professionals have been trained and sent to higher-level schools.