Abstract: The strategy of Higher Vocational enrollment expansion puts forward new requirements on the scale of enrollment expansion, the structure of students source, and the admission method. For the first time, "stable employment" is taken as a macro-control means for social and economic development and vocational education upgrading. However, the expansion of vocational education also brings new problems and difficulties for the promotion of enrollment expansion policy and the development of "market-oriented" enrollment. Under the guidance of the concept of ecological education, this paper makes ecological thinking on the problems in the process of promoting enrollment expansion, analyzes the problems of internal education elements and ecological links of higher vocational education ecosystem under the background of enrollment expansion, so as to provide theoretical basis for exploring the optimization strategy of higher vocational education ecosystem and improving the quality of Higher Vocational enrollment expansion work, and to formulate relevant development for higher vocational education management departments Policy provides reference.

Key words: Higher vocational enrollment expansion, Ecological environment, Populations, Ecological chain