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Using the experiment data of groundbased artificial rain enhancement in warm clouds carried out in Zhouning Reservoir in Fujian from April 2012 to August 2013， the rain enhancement effectiveness under different conditions is analyzed based on the effectiveness assessment of all cloud seeding experiments with the regional correlation method. The results show that the average enhancement of rainfall in warm clouds in Zhouning Reservoir reaches 51 mm； the effectiveness of rain enhancement is most obvious in warm clouds under the influence of the warm and moist air flowing from southwest； also， the multipoint and multitime rain enhancement operation can help improve the effectiveness. The effectiveness assessment on precipitation enhancement concludes that the precipitation enhancement in warm clouds with grounded stoves is suitable for southern areas.