In recent years, the textile industry at home and abroad continue to set off the revolution in fiber, functional health care textiles into the mainstream market. Clothing made of bamboo charcoal modified polyester fiber, welcomed by consumers, won the "black diamond" reputation. It not only has the natural and environmental characteristics, and rich in minerals, more far-infrared, negative ions, thermal storage and other functions, very suitable for weaving personal wear clothing. However, in the industry, there has been no qualitative method of modifying charcoal with bamboo charcoal, which has led many unscrupulous traders to find opportunities to mix their products and make such products on the market mixed. In view of this, the provincial fiber inspection bureau through access to information, a large number of tests to explore the bamboo charcoal modified polyester fiber identification method. The method covers the definition of bamboo charcoal modified polyester fiber, microscopic features and how to use the dissolution method, the discoloration method to identify the fiber. This method fills the blank of the qualitative analysis of bamboo charcoal modified polyester fiber of our bureau and promotes the testing ability of our bureau to a new level.