Absorption characteristics of formaldehyde (one of odors) were investigated using a bubble tank. The capacity of reaction tank made of acrylic is I liter and the experiment was carried out as semi-batch mode (for given absorbent packing, formaldehyde was fed continuously with flow rate of 2 liter/min). As operating variables of experiment, concentration of formaldehyde (400~800 ppm), absorption temperature (25~45℃), and packing volume of absorbent (100~300 mL) were used. The experimental results showed that the removal efficiency of formaldehyde decreased from 5 to 10% as the concentration of formaldehyde and the absorption temperature increased from 400 to 800 ppm, and from 5 to 10%, respectively, while it increased with the increase of the packing volume of absorbent.