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This study aims to examine the physical and chemical water quality and the relationship between plankton and water quality in the area of Pru-Chee Public Park, Khok Lor Subdistrict, Mueang District, Trang Province. The research was conducted over a period of two months. Water samples were collected from three points along the edge of the pond, with three samples taken at each point. The collected parameters included phytoplankton and zooplankton along with measurements of temperature, pH, DO (dissolved oxygen), nitrate, and alkalinity. The study found that the physical and chemical water quality parameters were as follows: the average water temperature was 28°C, the average dissolved oxygen (DO) level was 4.5 mg/L, the average pH was 7, the average water hardness was 195.0 mg/L, and the average nitrate level was 10.0 mg/L.The water quality in the Pru-Chee Public Park area was found to be within acceptable limits for sustaining aquatic life when comparison to standard values. However, for domestic and consumption purposes, the water would require standard disinfection and general water treatment processes before use. The study of phytoplankton and zooplankton, conducted using a plankton net and water sampling bottles from each location at a depth of approximately 10 centimeters below the surface, revealed the presence of 16 genera of phytoplankton, including Euglena, Scenedesmus, and Oocystis. For zooplankton, 19 genera were identified including Colurella, Uncinata, and Vorticella, along with one phylum, Rotifera, and Cyclopoid copepod, belonging to the order Cyclopoida, were recorded. The presence of multiple genera of phytoplankton and zooplankton indicates for the water quality in this area to support a diverse range of aquatic organisms to be capable of thriving in this environment.