The experiment is processed in lithium bromide falling film generator with the horizontal fin tube with inside grooves. The results of the experiment demonstrate that the fin tube with inside grooves can be used in the generator of absorption heat pump driven by lower temperature heat source to augment the heat and mass transfer. To compare with the smooth tube, the fin tube with inside grooves can raise the heat convection coefficient at the side of lithium bromide solution by 42 to 61 percent, and can raise the coefficient of mass transfer by 27 to 47 percent. It is the base to use a proper augmentative tube for the lithium bromide falling film generator of absorption heat pump.
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