The perpose of this study is to research forest recreation use impacts on water quality. According to the information gathered, we have several conclusions can be mentioned: 1. The difference in number of visitors between weekend and work days are so large that the method of selecting and controll water pollution has to be modified. 2. The waste water in Nai-Ton forest recreation area, producted by campers reaches 62 liter each day each person. In order to maintain the required water quality, it is necessary to control So4(superscript -2) in waste water. 3. The degree of water pollution caused by forest recreation activities varies with different visitor behavior, couditions of the resource and planing and managing effeorts. Thus preventing and controlling measures Should be adjusted to different condition.