Based on the conventional meteorological observation data and ECMWF reanalysis data, two cyclone heavy rain processes in 26 and 27 May 2013 (Process 0526) and 10 and 11 May 2014 (Process 0510) in Qingdao are analyzed. The results indicate that in Process 0526, the relative humidity at 850 hPa before the heavy rain was higher and the duration of rainfall was longer, and in Process 0510, the relative humidity at 850 hPa before the heavy rain was lower and the duration of rainfall was shorter, but stronger. The main causes of longer duration and the larger accumulated of Process 0526 was the better lowlevel wind speed and relative humidity conditions and longlasting upward motion, as well as continuous water vapor transport. In the process of Process 0510, the ground convergence line was a key factor in triggering the shorttime extreme heavy rainfall, and the stronger upward motion was favorable for the short time extreme heavy rainfall.