Abstarct: Abstract Runoff is one of the most important hydrological variables. In order to developing, planning and managing the water resources, runoff precise information and flow intensity is necessary. Runoff simulation basis in different hydrological models by meteorological data precipitation data plays the most significant role. Considering the importance of rainfall data in various fields and lack of a suitable distribution of rain gauge specifically in mountain watersheds. it is essential to estimate the rainfall data in every possible way and evaluate their accuracy. In this research, firstly three satellite precipitation products including IMERG-LR of Near Real Time type, TRMM 3B42RT-V7 of Real Time type and PERSIANN-CDR of Final Run type from year 2000 to 2018 has been evaluated by using 41 rain gauge stations. These three stations were Synoptic around Neishaboor watershed on a daily and monthly time scale. Secondly the monthly runoff of the basin was simulated using the soil and water assessment model (SWAT). Runoff simulation was carried out in ten years from 2000 to 2009. The parameters and coefficients of the developed model were calibrated by SUFI2 algorithm in SWAT-CUP. The results of the accuracy assessment of satellite precipitation products shwed the superiority of PERSIANN-CDR over the other two products in estimating precipitation. On the other hand, due to adjustment of estimated daily precipitation error, all three satellite precipitation products have showed much better performance in the monthly scale than the daily scale. In addition the results of SWAT model have also indicated that the model baxsed on gauge has the best function among the four developed models in runoff simulation. baxsed on the satellite precipitation products, 3B42RT-V7 and PERSIANN-CDR have been showed the best performance respectively, and with a small differance IMERG-LR presented the weakest performance in runoff simulation. In conclusion, the achievement of acceptable accuracy criteria and the maximum coverage of simulated runoff in the uncertainty range in both calibration and validation periods indicate the ability of the satellite precipitation product collection in runoff simulation.