A series of experiments were conducted to evaluate how the formaldehyde concentration indoors could be affected by some environmental conditions.The factors to be tested included the formaldehyde emission of panel materials,panel setting coefficient（panel quantity to room volume）,times of air exchange,and indoor temperature and humidity.Results found that under the current panel setting coefficient of 0.6 m,2,/m,3, and environmental conditions,to make the indoor formaldehyde concentration of a room attain ≤0.10 mg/m,3, or ≤0.08 mg/m,3,the formaldehyde emission of panels should be less than 0.5 mg/L and 0.3 mg/L respectively.