In this paper, the conventional meteorological observation data, satellite and radar data and NCEP 1°×1° reanalysis data are used to diagnose and analyze these two different extreme precipitation characteristics in the above two regions. The extreme precipitation in Zhejiang shows the characteristics of the typical tropical precipitation system. The extreme precipitation in Shandong is a long-term, medium-intensity "continental frontal" precipitation. The typhoon's symmetry and intensity are obviously enhanced. At the same time, moving speed is slower than that of other typhoons during the same period, which leads to the long-term influence of the spiral rainband in the direction of typhoon. Under the influence of the super strong typhoon cloud wall, the wind and rain in Zhejiang rapidly increase. In addition, the double typhoon and coastal mountainous terrain have an increasing effect on precipitation. The extreme precipitation in Shandong area is mainly affected by the combination of inverted trough and the west upper trough on the north side of typhoon. Sensitivity analysis find that the precipitation of Shandong Province has a good correlation with the intensity of the southerly jet, while the continuous maintenance of the typhoon circulation, high gradient of the height field and the latent heat feedback of the precipitation together lead to the low-level jet (>20 m·s^-1). At the same time, the west upper trough and the typhoon trough are nearly equivalent, forming a stable "front area", in front of which multiple convections continue to develop, forming a "train effect", lately cold air invades the northeast side of the typhoon center, however good circulation still maintains in the north part of typhoon. The above conditions consistently maintained a strong "frontal precipitation" in Shandong region. The comparison of the strength of Western Pacific Subtropical High(WPSH), westerly upper trough and the typhoon circulation is the key factor in the current typhoon precipitation forecast.