In order to study the impacts of soil properties on the quality of tea,path analysis method was used to analyze the direct and indirect effects of soil properties on water extracts,polyphenols,catechins and caffeines of tea in the main region of famous green tea-producing area in Guizhou Province.The results showed that there was no significant correlation between the soil properties and quality of tea.The impact of soil on quality of tea was caffeines>catechins>water extracts>polyphenols,the determinative coefficients were 0.854,0.830,0.787and 0.705,respectively,and the residual coefficients were 0.382,0.412,0.462and 0.543,respectively.The results also showed that soil properties could express more than 50%factors that influence tea quality.