Abstract: The physical meaning of the refrigerator non-adiabatic capillary model that considered six flow residence parts,was discussed.The performance of non-adiabatic capillary in refrigerator under different conditions was study by numerical method according to a new model of non-adiabatic capillary.The effect of three different working conditions,including condensation temperature,evaporation temperature,reheater locations,was considered to simulate the influence of the function performance of the capillary.The simulation result shows that the condensation temperature is of the most influential to the function performance.Finally,from a preliminary experiment,it was found the this model is of high precision.