Based on the social representation theory,this study analyzes the structural characteristics of Chinese EFL learners'Chinese(L1)and English(L2)lexical-semantic networks established on the data of semantic fluency tests,and compares the compositions and influence distribution patterns of the central and peripheral systems of the two networks using the social network analysis tool Ucinet.The results reveal that the central systems of the two networks share a large number of words while their peripheral systems differ greatly;word influence of.the L1 lexical-semantic network is more evenly distributed while that of the L2 network is more centralized.The study suggests that the L2 lexical-semantic network is underdeveloped in its peripheral system and lexical retrieval mainly depends on its central system,which points to the necessity of strengthening semantic connections among words in the peripheral system in vocabulary instruction so as to improve the overall function of the L2 lexical-semantic network.