The research has objectives for study the phytoplankton caused by environmental changes in Jehson and Jude Peat Swamp at Phuket province which the environment has been changed in the aspects as Morphology, Taxonomy,The arrangement of the cells, Ecology. Which it has collected the data during the month of December 2557 until March 2558 as the point area that we have kept the examples of 2 Peat Swamps such as Jehson Peat Swamp which 4 points and Jude Peat Swamp which 2 points and it was taken photographed by the microscope for categories diagnostic and has evaluated the qualities of water by using phytoplankton.