Abstract: Southwest State of Guizhou Province locates in the Yunnan\|Guizhou Plateau， where a large number of ancient tea germplasms was found. These tea trees are important tea genetic resources which are originally evolved， with strong resistance and specific biochemical composition. The site soil nutrient of ancient tea trees in the Southwest State of Guizhou Province was analyzed. The results showed that the soil pH value of ancient tea trees was between 400 and 609， the soil pH of QX\|2， QX\|3， QX\|4， QX\|8， QX\|10， QX\|11 and QX\|12 was suitable for tea trees growth. Content of organic matter was 8270 g·kg-1， total nitrogen 405 g·kg-1， total phosphorus 233 g·kg-1and available nitrogen 19273 mg·kg-1， which were in appropriate level. The content of active phosphorus was 2095 mg·kg-1 and active potassium was 15839 mg·kg-1， which were insufficient. Microelement content was within a desired range for the growth of tea plants. The nutrient content of QX\|7 was higher， which belongs to the very rich range， then followed by QX\|6. But the nutrient content of QX\|8 was lower.

Key words: Southwest State of Guizhou Province, ancient tea trees, site soil nutrition