Abstract: In order to optimize the cloud seeding ground operation technology, 26 operations were selected for the study from cloud seeding ground operations in 2015-2017, and a regional multi-parameters dynamic contrast method (K-value method for short) was proposed. The K-value method was used to evaluate the operation effects brought by different equipments, number of shells, and methods of operation. The results show that the ground operation has a good rainfall enhancement effect, the rainfall enhancement rate within 3 hours after operation is 14.4%, and the effect is the best at 2 hours. The rocket has a faster rainfall increase speed and a larger rainfall increase rate, the effect brought by rocket is better than the antiaircraft gun. When the number of shells in a single antiaircraft gun operation is N≤35, or the number of shells in a single rocket operation is 2 < N≤5, the effect is better. The rainfall enhancement rate of successive operations (within 1 hour interval between two operations, and the distance between the operation sites is 5~7 km) is 11.2% higher than that of single operation, the effect of successive operations is better. The above optimization techniques were applied in 13 operations selected from ground operations in 2018-2020. Compared with the above 26 operations selected from 2015 to 2017, the average K value increased by 30.6%, and the rainfall enhancement rate increased by 6%. Compared with 7 operations without optimization techniques in the same period, the K value was higher than 0.85, and the aging time of K>1 was prolonged by 1 h. The optimization technology had obvious effect.