The year 2021 is the first year of the development of the meta-verse.，and also the explosion of virtual digital human.Virtual digital human，as a fusion of multiple advanced technologies，a media role with highly anthropomorphic，will be widely used in various scenarios in the meta-verse.

This paper classifies the virtual digital human according to the dimensions of technology，application and design style，and introduces the four stages of the development experience since from 1982.

This paper sorts out the current situation of the virtual digital human industry，and analyzes that the virtual digital human industry has good development prospects，both from the market size and the investment and financing.In terms of technical system，the virtual digital human technology is divided into five technical modules：character generation，character expression，synthetic display，recognition and perception，analysis and decision，and it is elaborated one.In terms of industrial ecology，the virtual digital human industry is divided into five parts：basic layer，core layer，application layer，capital side and regulatory party，and the core layer can be divided into three roles according to the upstream and downstream of the industrial chain.

This paper introduces the typical applications of virtual digital human from the five aspects of virtual idol，virtual staff，virtual anchor，virtual expert，and avatar，and selects Luo Tianyi，AIYA and other characteristic cases for auxiliary explanation.Finally，the development trend of virtual digital human is expected from the four perspectives of key technology，use threshold，commercial value and industry ecology.