In the context of educational informatization,the teaching mode of college English has undergone significant changes,and online teaching has gradually become a new direction of educational reform.In or-der to promote innovation in college English education models and build a comprehensive online teaching e-cosystem,the article analyzes the issue of ecological imbalance in college English online teaching from a constructivist perspective.Due to various factors,current online teaching of college English has problems such as imbalanced teaching environment,misplaced teacher-student relationship,limited classroom teach-ing,and incomplete evaluation function.Based on this,universities can fully leverage students'subjective initiative in constructing knowledge systems by creating an open learning environment,enhancing teacher-student communication and interaction,utilizing teaching resources reasonably,and constructing multidi-mensional evaluation mechanisms.