The emergence and development of teachers' profession can be roughly divided into four stages: non-professional stage; Professional stage; Specialized stage; Specialized stage.

Specialized stage

In the stage of specialization, with the popularization of basic education in major developed countries, the total demand for teachers began to shrink.

Demand transformation

Under the influence of many aspects, the demand for teachers in schools began to change from the urgent demand for "quantity" to the improvement of "quality"