Performance of SnS based photovoltaic solar cell is described in this research paper on the base of its numerical analysis. Cell structure consists of following sequence (p-SnS/CdS/Zno) for absorber layer, buffer layer and optical window, respectively. The numerical analysis is carried out by Photovoltaic cell Capacitance Simulator Software (SCAPS). After optimization of different parameters of the simulated device the results indicate that the photoconversion efficiency under standard AM1.5 illumination condition of the SnS-based photovoltaic cell is about 26%. Further, the effect of different parameters such as thickness of all device layers, concentration of dopants, compensation ratio and operating temperature is analyzed.