Nearly %40 of the world's energy consumption is consumed in buildings. This energy is supplied from various sources mainly from fossil fuel, which cost considerable and produce pollution. In the past decade with the advancement of technology, several new systems are incorporated. Among them solar energy is in the front of renewable energy sources, which is employed by using photovoltaic (PV) systems. PV systems are used for various sections in building industry such as for double skin façade (DSF) to generate electricity and reduce cooling load and heating load. To enhance operation of DSF with PV system, phase change material are recommended for providing heating during winter condition. In this study, the effect of heating of DSF+PV using phase change material (PCM) in investigational numerically using ANSYS-FLUENT software. Computation are made for the three days of 17th January,16th February,16th March of winter climate condition of Esfahan. For transient simulation a three dimensional double skin façade model which has solar blind in the cavity and phase change material attached to it is selected. Analysis are performed for blind angles of 15,30,45,60 and 75 and free convection is allowed to take place from the bottom to the top opening. The results show that the use of solar blinds in double skin facades, improves the heating performance of the building in the late afternoon and during the night time, when there is not sun. It is showed that the DSF+PV+PCM provide more hot air and improve thermal performance of solar blind system. Regarding both thermal and environmental comfort of residents, blind with 45 degree with PCM is recommended. Keywords: Double Skin Facade, Solar Energy, Phase Change Material, ANSYS-FLUENT