Laboratory simulation experiment was conducted by designing different forms and levels of N fertilizer and different levels of P and K fertilizer.Fertilizer solution was added into the soil according to the fertilizer concentration in the soil after fertilization,then the pH value of soil solution and the concentration of fluoride in it was determined at different times after fertilization for analyzing the effects of N,P and K fertilizer on the concentration of fluoride in soil solution under tea garden soil.The results were as followed:(1)Under the condition of single N fertilizer,the application of ammonium nitrogen and nitrate nitrogen increased the concentration of fluoride in soil solution,while amide nitrogen reduced the concentration of fluorine in the soil solution.The effects of the three forms of N fertilizer increased with time and N level.The concentration of fluoride in soil solution was negatively significant correlated with the pH value of soil solution(r=-0.658**)at 48 hour after fertilization.Nitrogen forms influenced the concentration of fluoride in soil solution by influencing the pH value of soil solution.(2)Under the condition of the same level of P and K,the concentration of fluoride in soil solution increased with the level of N.The application of P fertilizer significantly reduced the concentration of fluoride in soil solution,while K fertilizer increased it.Under the condition of the same level of N,the order of fluoride concentration in soil solution basically was N+K>N+P+K>N >N+P.Fluoride content in soil solution was highly positive correlated with N level(P<0.01),while it was highly negative correlated with the pH value of soil solution(P<0.01)at 48 hour after fertilization.The effect of N,P and K fertilizer on the concentration of fluoride in tea garden soil solution mainly caused by N fertilizer and the pH value of soil solution.Applying moderate amide N,or with P or P and K,in the tea garden can increase soil pH in some periods,reduce the concentration of fluoride in tea garden soil solution.Thus it provides a theoretical basis for reducing the availability of fluorine in tea garden soil by rational fertilization.