Based on the water quality investigation from August, 2016, to July, 2017, in Southern,Middle,Northern West YangchengLake,the spatial and temporal variations of nutritional status and water nutrients in West Yangcheng Lake were analyzed.The results are as follow： the nutritional status and nutrient of the West Lake of Yangcheng Lake have obvious seasonal changes and significant spatial differentiation. According to the eutrophication evaluation standard the trophic statue was classified to medium eutrophication. TSI and the concentration of chlorophyll-a showed a significant seasonal variations with one concentration peaks which occurred in spring and summer,however, the concentrations of TN and NH3—N showed a significant seasonal variations with one concentration peak which occurred in winter and the summer and autumn mean of TP was significantly higher than that of spring and winter. Although the time difference between nutritional status and N,P nutrients is large, the concentration is no longer the limit. When the temperature and light are suitable, algae bloom vigorously in spring and summer. Nutritional status and water nutrients in the southern West Yangcheng Lake were inferior to middle and northern parts，as numbers of pollutants in southern rivers were larger than those of middle and northern rivers.Control measures of water nutrients discharges to rivers were desiderated.