Humidity controlling properties of bamboo charcoal after exposure to different carbonization temperature, heating rate and holding time were evaluated by using the three indices of equilibrium moisture absorption and desorption content, moisture absorption and desorption efficiency and humidity controlling stability. The results indicate that lower carbonization temperature and longer holding time are conducive to enhance the equilibrium moisture absorption and desorption content of bamboo charcoal, bamboo charcoal has higher equilibrium moisture absorption and desorption content in the case of low heating rate. Carbonization process parameters have little effect on the moisture absorption and desorption efficiency of bamboo charcoal. Bamboo charcoal has better humidity controlling stability under lower heating rate and shorter holding time.