In order to investigate nutrients in tea gardens of Kaiyang and to provide the theoretical basis for the production of tea with good quality and high yield, 158 soil samples were collected, pH, organic matter, total nitrogen, available nitrogen, total phosphorus, available phosphorus, total potassium and available potassium and the relationship between them was measured and analysed. The methods of principal component analysis and membership function of fuzzy mathematics were used to estimate the status of soil fertility by means of estimating IFI. The results showed that the soil of tea gardens of Kaiyang was slightly acid. The contents of soil organic matter, total nitrogen and available nitrogen were sufficient for tea growth. The contents of total phosphorus, total potassium, available phosphorus and potassium were low, and only 16.46%, 14.56%, 20.89% and 12.66% of the samples reached the soil nutrient levels with good quality and high yield tea garden soil standard. Soil intergrated fertility index (IFI) was 0.59. According to the value of IFI, tea garden with fertility at high and middle grade accounted for 61.40%, so the soil fertility quality of tea garden of Kaiyang belonged to middle level in general. It suggested that soil fertility management should focus on increasing the content of phosphorus and potassium and improving the pH value.