Abstract:

This paper introduced the forming and developing processes of Honghu Lake and then induced the major factors which influenced the evolution of Honghu Lake.Referred to Honghu Lake，geological activity and flood in the Yangtze River formed the precondition，and the ancient climate promoted the area change and swamp formation.Human activities accelerated the ecological deterioration in modern times and Threegorge Project will improve ecological restoration，but hasten the soil deposition.This paper put forward the solutions for ecological protection in Honghu Lake: government should strengthen management and legislation system;public awareness and protection activity should be improved;on the premise of the protection priority，natural resources in Honghu Lake can be exploited and utilized rationally；the connection of Honghu Lake and the Yangtze River should be considered and be set into practice in order to achieve the exchange of water and fishes；and research on ecological water requirements for Honghu Lake should be strengthened，and the longterm influence of the Threegorge Project should also be assessed.

Key words: evolution, ecological protection, Honghu Lake, Threegorge Project, ecological water requirements