In this study, by assuming the occurrence of earthquakes on faults in the Central Alborz area, the warning time around the Tehran Region and its surroundings is investigated to determine the effectiveness of the earthquake warning system for these areas, and also to consider the option whether it is possible to issue warning alerts based on the geometry of the faults within the area. At first, the related parameters and the sensitivity of the values in the early warning system are investigated and the optimal values are used. Then, for sources, the warning time is obtained as the difference between the arrival time of the initial P wave to the fourth station plus the processing time and the arrival time of the destructive S wave. The probability of earthquakes is calculated using the Poisson distribution and the density of the earthquakes is also examined. subsequently, warning time histograms are produced. The distribution of warning time values and intensity of earthquakes in each region indicate the usefulness of the earthquake early warning system.