In absorption refrigeration technology, there exit two methods to enhance the water vapor absorption into the LiBr aqueous solution: adopting the high efficient components of heat and mass transfer and adding surface-active agents into the LiBr aqueous solution. The absorption enhancement using surface-active agent for laminar flow of falling film along a vertical plate is investigated experimentally. In the experiments, the 2-ethyl-1-hexanol is chosen as the surface-active agent and the experiments are designed to investigate the absorption enhancement of falling film considering the factors of falling film Reynolds number, solution inlet temperature, absorption pressure, surface-active agent concentration and falling film length.