Abstract: Based on the observation data of Doppler radar, precipitation and aircraft, the design and effect analysis of rainfall enhancement in Meso Scale Vortex in Inner Mougolia Irrigation Area of Yellow River which moved towards Northeast and influenced Jilin Province on April 12, 2016 were carried out. According to the requirements, the implementation scheme of rainfall enhancement was designed. The influence region and the control region were selected. Changes of radar echo and precipitation in these regions before and after the operation were analyzed. Result shows that Meso Scale Vortex in Inner Mougolia Irrigation Area of Yellow River moved towards Northeast and was in cooperation with the upper trough. It brought plenty of vapor to Jilin Province and was with good seeding conditions. By considering many influencing factors, the flight operation scheme was designed and the operation was carried out. By comparing, the echo in the influence region is obviously stronger than that in the control region. Echo maintenance time is increased. The analysis shows that the maintenance time of precipitation in the influence region is also longer than that in the control region.