The principle of gradual progress refers to the sequential arrangement of teaching content, teaching methods and exercise load, from easy to difficult, from simple to complex, gradually deepening and improving, so that students can systematically master basic knowledge, technology, skills and scientific exercise methods.

The principle of progressive education is based on the following two points:

1. People's understanding of the laws of things, people's understanding of objective things, there is a step-by-step process from simple to complex, from low to high, from intuitive to abstract, people can not reach the understanding of the essence of anything in one step.

2. The law of action formation and the stage change of action formation are restricted by the physiological function of human body and dominated by the laws of conditioned reflex, analysis and comprehensive logical thinking. Mastering motor skills will have a gradual process from simple to complex.