The aim of this paper is to zoning of seismic hazard in Tehran and adjacent areas. In this regard, after identifying the faults in the region, investigating the seismicity rate and tectonics of the area and preparing seismotectonics and seismicity maps, source zoning operation was performed to determine seven potential seismic regional sources for the study area. After determining the seismicity parameters for each source, risk analysis was performed by probabilistic method and seismic hazard zoning maps were prepared return periods of 475 years and 2475 years. Then, by collecting information about tectonic seismicity of the area and determining the sources, seismic parameters called a-value and b-value were obtained by ZMAP software. Then, using the outputs of OpenQuake software, maps related to peak ground acceleration (PGA) and spectral acceleration (SA) were prepared using QGIS software.