Groundwater quality in saltwater intrusion zone is featured as the continuous and gradual and has fuzzy boundary in the southern Laizhou Bay. Based on the groundwater sampling and chemical components test, fuzzy cluster analysis was conducted by adopting a series of steps including standardized transformation, with angle cosine and transitive closure calculated by square method to divide groundwater into three classes. On this basis, box chart was applied to identify the distribution of percentile, median, extreme values and outliers of groundwater components data in each class. Mean value of components was drawn for each class by radial diagram, and chemical types of groundwater were spotted by Piper diagram. Representative indices were selected on the basis of correlation analysis to draw contour map. The spatial structure of each index and the internal mechanism were discussed by analyzing both the contour map and zoning map based on fuzzy cluster analysis. To sum up, Region Ⅰ was defined as key treatment area of seawater intrusion, and Region Ⅱas comprehensive prevention and remediation area and Region Ⅲ as brine area.
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