Abstract: A meteorological target detection method is proposed for long range weather targets. Multi-scan technology is used, which can effectively cross the radar horizon to detect meteorological targets free of interference from the ground clutter. For the multiple beam swept close range airspace, the weighted average method is used to improve the probability of target detection. For remote meteorological targets more than 130 km, the method of beam filling coefficient correction is used to improve the accuracy of the detection. The simulation results show that this method can effectively detect the distribution of weather target aircraft in front of less than 600 km, and provide effective reference for flight safety, route selection and fly around strategy.