Introduction to Selenium-rich Tea Garden: Tianfang Selenium-rich Tea Garden is located in Dashan Village. Its soil properties are similar to the selenium-rich soil rich in stone coal in Ziyang, Shaanxi Province and Enshi, Hubei Province, two other selenium-rich villages in the country. After analysis and testing, the soil of Tianfang Selenium-rich Tea Garden contains 4.4 micrograms of selenium per gram, which is 20 times higher than that of ordinary soil. The tea grown here contains not too much or too little selenium, which is most suitable for human body needs.