In order to comprehend the terrestrialization situation and its driving factors in Lake Wuliangsu. 17 sampling points of Lake Wuliangsu were sampled and investigated in August 2013. The results showed that: two different evaluation methods for the area had the same results, but the comprehensive index which be acquired by the method based on biomass and deposition rate was slightly lower than the value which be acquired by the method based on species of plants and mud deep; Spatial differences exist Lake Wuliangsu swamp degree: nearly estuary points> eastern lake points> lake downstream points. The composite index of estuary and lake at the eastern is between 3-4, belonging to the latter part of the swamp; The composite index of lake downstream is between 2-3, belonging to swamping peak, S6 and T5 which were not having swamp problems. Wuliangsuhai swampy lake rooted exogenous substance causing siltation darken and raising levels of nutrition, the main driving factors of the acceleration of the swamp is irrational human activities.