This paper introduces a double-glazed window with curtains which is low-cost, low power consumption, simply be produced and installed for residential buildings in severe cold and cold zone. By using the CFD method, we conducted the simulation analysis of the indoor thermal comfort of test model building installing double-glazed window with curtains. Through analysis, we found that the indoor thermal comfort of test model building installing double-glazed window with curtains in different operating principle was not good. We have to improve the structure and define the open area of the double-glazed window installing curtains, so as to satisfy the needs of the indoor thermal comfort of test model building.