Abstract: In virtue of Relev method , a systematic vegetation survey was conducted in Yushan of Jiangsu Province , and 5 vegetation types and 10 forest communities were divided .There are 227 species of woody plants , belonging to 61 families and 124 genera .The analysis of woody plants families in Yushan of Changshu showes that tropic elements are dominant and the plants displays a characteristic of transition and blending .With relation to the areal-types of woody plants genera , the temperate areal-types are the most (68 genera), which accounting for 54.85 % of total genera ;and the tropic areal-types are more (49 genera), which accounting for 39.52 % of total genera .This showes that the former are full developed and become the dominant elements of woody plants .[ Ch , 3 tab .14 ref .]