Abstract: On the base of DRASTIC method，the depth to groundwater level and other 10 parameters were chosen to assess groundwater vulnerability in the lower Liaohe river plain according to specific features of this area．The rating system is performed by the way of typical areas and relative standards． AHP and decision analysis methods were used to obtain the weighting system．Based on the established assessment system，groundwater vulnerability assessment was conducted by the method of fuzzy pattern recognition in this area．There is a high fit degree between the assessment results and the pollution situation of groundwater．

Key words: the lower Liaohe river plain, groundwater vulnerability, index system