Based on the EAR5 daily reanalysis data and observational precipitation data at 2437 stations in China from 1979 to 2020, this study analyzes the zonal oscillation characteristics of the East Asian subtropical westerly jet and its relationship with the East Asian atmospheric circulation and precipitation during the Mei-yu period. The results reveal that there are two intensity and position variation types for the East Asian subtropical westerly jet during Mei-yu period by comparing the 200 hPa regional mean zonal wind anomalies in a large value area of standard deviation (37o-47oN, 100o-120oE) with the two jet stream centers over the Western Pacific (37o-47oN, 140o-160oE) and the Tibetan Plateau (37o-47oN, 80o-100oE). For the first type, the jet stream center is situated over the western Pacific Ocean in the early stage, then the intensity of the jet stream over the western Pacific weakens, and an enhanced jet stream center appears on the western side of the jet stream. The maximum zonal wind shows a rapid westward migration feature, which is called the rapid westward migration type. For the second type, the jet stream center is located over the Tibetan plateau in the early stage, then steadily strengthens and moves eastward. The maximum zonal wind exhibits a gradual eastward migration feature, which is referred to as the gradual eastward migration type. The analyses of circulation and precipitation corresponding to the two jet stream oscillation types indicate that, with the rapid westward migration of the jet stream, the east ridge point of the South Asian High is located to the east, and the western Pacific Subtropical High’s intensity is increased and moved to the west, and the circulation pattern in the middle and high latitudes is characterized as "two troughs and one ridge". Furthermore, as the meridional increase of 200 hPa divergence and the 700 hPa water vapor transport rises to the north, the position of the rain belt shifts from south to north. Corresponding to the gradual eastward migration type, the east ridge point of the South Asian High is located to the west, and the western Pacific Subtropical High’s intensity is decreased and contracted to the east, the circulation pattern in the middle and high latitudes is featured as "two ridges and one trough," and the blocking highs occur more frequently over the Okhotsk Sea region. Meanwhile, the upper-level divergence in the lower reaches of the Yangtze River weakens, while the upper-level divergence and lower-level water vapor transport strengthen in the upper reaches of the Yangtze River, thus forming an antiphase change in precipitation intensity between the upper and lower reaches of the Yangtze River.