In order to study the theoretical cycle characteristic of [mmim]DMP(1-methyl-3-methylimidazolium dimethylphosphate)/methanol absorption refrigeration,the modified UNIFAC group contribution model and the Wilson model are established through correlating the experimental vapor pressure data of [mmim]DMP/methanol at T=280～370K and methanol mole fraction x=0.529～0.965.Thermodynamic performances of absorption refrigeration utilizing [mmim]DMP/methanol,LiBr/H2O and H2O/NH3 are investigated and compared with each other under the same operating conditions.From the results,some conclusions are obtained as follows:1)the circulation ratio of the [mmim]DMP /methanol absorption refrigeration is higher than that of the LiBr/H2O absorption refrigeration,but still can be acceptable and tolerable.2)The COP of the [mmim]DMP/methanol absorption refrigeration is smaller than that of the LiBr/H2O absorption refrigeration,while it is higher than that of the H2O/NH3 absorption refrigeration under most operating conditions.3)The[mmim]DMP/methanol absorption refrigeration are still available with high COP when the heat source temperature is too high to drive LiBr/H2O absorption refrigeration. In order to study the theoretical cycle characteristic of [mmim] DMP (1-methyl-3-methylimidazolium dimethylphosphate) / methanol absorption refrigeration, the modified UNIFAC group contribution model and the Wilson model are established through correlating the experimental vapor pressure data of [mmim ] DMP / methanol at T = 280-370 K and methanol mole fraction x = 0.529-0.965. Thermoodynamic performances of absorption refrigeration utilizing [mmim] DMP / methanol, LiBr / H2O and H2O / NH3 are investigated and compared with each other under the same 1) the circulation ratio of [mmim] DMP / methanol absorption refrigeration is higher than that of the LiBr / H2O absorption refrigeration, but still can be acceptable and tolerable. 2 ) The COP of the [mmim] DMP / methanol absorption refrigeration is smaller than that of the LiBr / H2O absorption refrigeration, while it is higher than that of the H2O / NH3 absorption refrigeration under most ope rating conditions.3) The [mmim] DMP / methanol absorption refrigeration are still available with high COP when the heat source temperature is too high to drive LiBr / H2O absorption refrigeration.