Ai4EComponentLib.jl(Ai4EComponentLib) is a component-base model library based on Julia language, which relies on the differential equation solver DifferentialEquations.jl and the symbolic modeling tool Modelingtoolkit.jl. To handle problems in different physical domains, Ai4EComponentLib tries to build them with component-base model. Supported by a new generation of symbolic modeling tools, models built with Ai4EComponentLib are more flexible and scalable than models built with traditional tools like Modelica. This paper will introduce the instance and general modeling methods of Ai4EComponentLib model library.