Soil pH and organic matter are important index of soil fertility.Phenolic acids in the soil is also an important organic substance which has a complex relationship with the pH and organic matter.In this paper,the tea garden soil in Mingshan district，Sichuan province was chosen as the research objective to study the influence of tea planting age on soil pH value，content of organic matter and phenolic acids，and to explore the relationship between them.The results showed that with the extension of tea planting age，the pH value of each soil layer showed a downward trend in varying degrees，with a tendency of 10 years < 7 years < 5 years < 3 years < paddy soil，and the acidification was obvious in the surface soil.With the extension of tea planting age，the organic matter of soil，total phenolic acids and watersoluble phenolic acids content were increased.Correlation analysis illustrated that the total phenolic acids from 0~10 cm of the soil was negative to the pH of that layer，and the watersoluble phenolic acids from 10~20 and 30~40 cm of the soil were negative to the pH of that layer;the total phenolic acids from 10~20 cm of the soil was positive to the organic matter of that layer，and the watersoluble phenolic acids from 10~20，20~30 and 30~40 cm of the soil were positive to the organic matter of that layer.It was concluded that the content of phenolic acids in soil with different tea planting ages was important factor that influenced the pH and organic matter.