摘要

Bursaphelenchus Xylophilus is a kind of pests that does great harm to pine trees. This paper discusses a time-varying age-structured SEIR model of Bursaphelenchus Xylophilus. First, we build the age-structured SEIR tune-varying system model of Bursaphelenchus Xylophilus; then with Characteristic Line and integral equation theory and functional analysis method prove the existence of the solution to the system and give the expression of the solution.