Abstract: Monthly monitoring from March 2015 to February 2016, temporalspatial dynamics of chlorophylla in the Yangcheng West Lake and also the potential influencing factors were analyzed. The results showed that, seasonal variation of chlorophylla in were obvious, ranging from 1193 μg/L to 6667 μg/L and with an annual mean value of 2754 μg/L±2034 μg/L. The minimum and maximum value of chlorophylla concentration appeared in January 2016 and August 2015, respectively. The concentration of chlorophylla was different in the spatial distribution. The content of chlorophylla reached the highest in the section I, followed by section II and Section IV, and section III was the lowest. The comprehensive trophic state index was 507-593, and the annual mean value was 556. In general, the lakes was in a state of mesotrophic. According to Pearson correlation and stepwise regression analyses, chlorophylla was significantly positively correlated with water temperature and negatively with dissolved oxygen and transparency. Pearson correlation analysis was further carried ou twith total nitrogen (TN), total phosphorus (TP), and the ratio of nitrogen and phosphorus (N/P). Chla was found to correlated weakly with total nitrogen while significantly positively with total phosphorus, and negatively correlated with N/P ratio, suggesting a limitation by phosphorus. Key words：Yangcheng west Lake; chlorophylla; environmental factor; correlation analysis