The researches have shown that the reason of flood damages increment is not the frequency and magnitude of floods but the intense use of flood terrains and limiting the river cross section by construction of (residential buildings, bridges etc…) are the main reasons of hazardous floods creation. In this research GIS (Geographic Information System) has been used to specify flood hazard terrains according to hydraulic model in Panjshir River territory which is one of the most important parts of this research. HEC-HMS software has been used for hydrologic modeling and creation of flood hydrograph in with frequency of (10, 20, 50) years for related catchment areas. Flow scheme for precipitation modeling is according to IDF (Intensity Duration Frequency) Curve which is derived from near station to site. HEC-RAS software has been used to simulate forecast flood on Panjshir River. All mentioned models’ documents have been developed in GIS environment, ArcMap Software using their related extensions (HEC-Geo HMS & HEC-Geo RAS). Digital elevation models with 30-meters cell size accuracy are extracted from USGS website and 5 meters DEM from MAIL according site coordinates has been studied & analyzed. One dimensional steady flow analysis results have shown that a major area in river territory is under the flood hazard and destruction which draws a huge damage to our compatriots. Thus, I recommend Flood prevention & control structures in this area in order to improve living conditions of residents. By this, flood hazards are being prevented & a residential area along Panjshir River which a joyful area is being built. Flood frequency in (50) years has been derived from Analysis using Gumbel Distribution Method with respect to (17) years flow, from “Omerz” (Panjshir) hydrometric station.