In this research, the influence of the polar jet streams on the daily rainfall of synoptic stations in Iran in the cold season (autumn and winter) during a period of 30 years (1988-2017) has been studied. Based on the threshold of rainfall exceeding 30 mm as heavy rainfall and based on the 95th percentile, 972 days were identified and clustered as days of heavy rainfall in 31 synoptic stations of Iran, and the representative days of each cluster were selected. In the following, in order to find behavioral patterns and investigate the interaction of the polar jet stream on the intensification of the processes of frontal formation and the occurrence of heavy precipitation, the data of the zonal and meridian wind component, divergence, geopotential height, vertical velocity of the atmosphere (omega), vorticity, relative humidity, specific humidity, temperature and average sea level pressure were studied. The results of these analyzes showed 6 circulation patterns in the region, each of these patterns, due to the dominance and establishment of numerous troughs and ridges in the atmosphere, on the path of the polar front jet stream transfer to the middle latitudes of the earth and also the fluctuations of its seasonal average position have been influential. The results showed that the meridian mode of the jet stream axis has caused the creation and production of cores for the rate of occurrence of more rainfall in the western region of Iran.