As　a　new　absorption　refrigeration　system,　NaSCN-NH3　diffusion　absorption　refrigeration　system　uses　a　solution　of　an　inorganic　salt　compound　as　the　absorbent,　ammonia　as　the　refrigerant.　This　paper　presents　some　parameters　that　affecting　on　the　performance　of　NaSCN-NH3　diffusion　absorption　refrigeration　system.　On　the　basis　of　simplifying　its　thermodynamic　cycle,　the　preliminary　heat　and　mass　transfer　mathematical　model　was　built　to　calculate　the　system　COP,　cooling　capacity,　heating　capacity　on　various　generator,　condenser,　evaporator,　absorber　and　solution　heat　exchanger　situations.　A　kind　of　performance　test　rig　was　employed,　the　experimental　results　were　collected　to　establish　the　relations　among　different　system　parameters,　and　to　validate　the　simulation　results　to　improve　the　theoretical　model.　By　comparing　simulation　and　experimental　data,　the　results　show　that　the　COP　of　NaSCN-NH3　diffusion　absorption　refrigeration　device　set　to　2　kW　cooling　capacity　can　reach　0.4,　when　the　regeneration　temperature　is　80°C∼105°C,　the　concentration　is　0.38∼0.5　and　condensation　temperature　is　30°C.　If　the　lower　condensation　temperature　can　be　chosen,　high　efficient　heat　source,　heat　exchangers　and　cooling　mode　also　can　be　realized,　the　system　COP　will　be　expected　to　reach　0.6∼0.7.