Abstract: Investigation on dynamics of Chl a concentration and water environment of four intensive fishponds, which cultured Oxyeleotris marmoratus, Ctenopharyngodon idellus, Micropterus salmoides and Channa argus, were carried out between May 2012 and December 2012 in Pearl River Delta. Variance analysis and Multiple Comparison (LSD) were used to study the difference of the water parameters of the fishponds, and stepwise multiple regression was used to analyze the relationships between Chl a and environmental factors in the investigating ponds, while the Self-Organizing Map (SOM) analysis was used to explore the water quality conditions. Results showed that TN, TP and Chemical Oxygen Demand (COD_Mn) of the ponds were varied from 1.52~22.76 mg/L, 0.20~4.82 mg/L and 3.71~50.76 mg/L, respectively, which indicated the water were overloaded by nutrients and organic contamination. There was significant difference on Chl a concentration (P<0.05) among the four kinds of fish ponds. Ctenopharyngodon idellus ponds had the highest Chl a concentration (mean value), followed by the Channa argus ponds and the Micropterus salmoides ponds, and the lowest was Oxyeleotris marmoratus ponds. Besides, the relationships between Chl a and environmental factors were different in each sampling ponds. Water environment parameters, such as salinity, conductivity, Total Dissolved Solids (TDS), COD_Mn, TN, TP, NO₃^--N, PO₄^3--P in Channa argus ponds were obviously higher (P<0.05) than other kinds. Based on SOM analysis, five clustering groups on water quality of all sampled ponds were found according to spatio-temporal patterns, and the water environment quality changed worse from Oxyeleotris marmoratus, Micropterus salmoides, Ctenopharyngodon idellus to Channa argus ponds.