Abstract: To modify the physical and chemical properties of the soil and to improve the yield and quality of the tea, a field trial on two soil conditioners (i.e., humic acid and weathered coal) was conducted.The conditioners were added to the soil at a tea plantation with a balanced use of nitrogenous, phosphorus and potassium fertilizer for the previous 3years.The results showed that the weight/volume of the soil was reduced by 7.22%-15.44%;the porosity, pH, organic matter, total nitrogen, total phosphorus, total potassium, alkali-hydrolyzable nitrogen, available phosphorus and potassium of the soil increased by 8.24%-18.62%, 2.97%-18.61%, 8.86%-27.22%, 9.80%-45.10%, 6.12%-40.82%, 4.52%-40.16%, 8.81%-45.75%, 0.62%-67.55% and5.56%-36.09%, respectively;and, the yield and polyphenol content of the tea increased by 3.19%-14.24%and5.21%-10.73%, respectively.Specifically, the application of the " chemical fertilizer+humic acid+weathered coal" showed the most significant effect on increasing the yield and polyphenols of the tea and the alkali-hydrolyzable nitrogen content in the soil.The application of the " chemical fertilizer+humic acid" appeared to be most significant in bringing about the decrease on the volume-weight and increases on the porosity, organic matter, total nitrogen, total phosphorus, total potassium, available phosphorus and potassium of the soil.And, the treatment with the "chemical fertilizer+weathered coal" was most effective in raising the pH of the soil.