Taking three centralized water supply sources in ji'an city as the research object，dissolved oxygen（DO），permanganate index（CODMn），five-day biochemical oxygen demand（BOD5），ammonia nitrogen（NH3-N），total phosphorus（TP） and iron（Fe） were as the selected parameter.Using linear regression analysis method and the analysis of seasonal Kendall test the water quality change trend in 2013-2018.The analysis results show that the water quality trend of each analysis factor obtained by the two methods is consistent.But the results of seasonal Kendall test are more accurate.By using two analysis methods，it was found that NH3-N and BOD5 in the three water supply sources were on the rise.Although the water quality was good at present，management should be strengthened in the later period to ensure the safety of drinking water quality．