It is found that higher temperature and longer treatment time led to its more weight loss, higher cellulose content, lower lignin and hemicellulose content, and lower moisture, but the difference became less with temperature increasing and treatment time prolonging, especially when temperature reached 150 and 160 C, the treatment time increased from 5 to 6 h, its moisture, lignin and hemicellulose content kept almost unchanged, its cellulose content began to decrease slightly