According to the central meteorological station, since August 27, the eighth typhoon “Bawei”, the ninth typhoon “mesak”, and the tenth typhoon “Haishen” have successively affected the northeast region. According to statistics, there are 40 typhoons entering Northeast China from 1949 to 2019. Among them, No.21 typhoon “Haima” in 2014, No.16 typhoon in 1974 and No.3 typhoon Rita in 1972 all went northward and reached a relatively northern position. < p > < p > the typhoon that reaches the highest latitude in China is “Haima”, which finally arrives in the northeast of Inner Mongolia Autonomous Region with latitude of 49.5 degrees north and affects Russia. Haima is an offshore tropical storm. Although its intensity is not strong, the central cloud cluster is dense and the water vapor is sufficient. In addition, it interacts with cold air in the northward process, resulting in large-scale heavy precipitation in China. < p > < p > among them, the No.21 typhoon “Feiyan” in 2018 ranked first, reaching 62.1 degrees north latitude and penetrating into Russia. The second largest typhoon in 2016, CANDU, reached 60.5 degrees north latitude. In the third place is the 13th typhoon “Lingling” in 2019, with latitude of 58.3 degrees north latitude. The moving direction of typhoon is affected by subtropical high (subtropical high), trough ridge of westerly belt, typhoon internal force (β effect), high-level system and double typhoons, among which the subtropical high is the most decisive factor. < p > < p > < p > < p > “bawai” and “mesak” are constantly northward under the guidance of subtropical high, bringing strong rain and rain weather to Northeast China, and so is “Poseidon”. In early summer (from mid June to late July), the subtropical high extends westward and northward to about 20 ° to 25 ° n, and the rain belt also moves northward to the middle and lower reaches of the Yangtze River to the south of Japan, forming a one month long plum rain season. Most of the Typhoons Affecting China are generated in the Northwest Pacific. Most of the typhoons generated in the Northwest Pacific originate from the southern edge of the subtropical high and move along the periphery of the subtropical high. Typhoon and subtropical high restrict and influence each other. Generally speaking, when the subtropical high is East-West banded and its intensity is stable, the typhoon on its southern side will move westward and its path will be stable. However, if the intensity of the subtropical high is not strong, when the typhoon moves to its southwest, it will cause the subtropical high to retreat eastward, and the typhoon may also turn and move northward. In addition, the typhoon can break the weaker subtropical high through the middle. Of course, the factors that affect the trend of typhoon are very complex, and the subtropical high is only one of them. To accurately judge the track of typhoon movement, we need to rely on the numerical forecast with updated time effect and the experience accumulated by forecasters over the years. < p > < p > in terms of domestic scope, whether a typhoon can enter the Northeast will directly affect its northernmost position. From 1949 to 2019, typhoons obviously prefer South China, while typhoons landing in Northeast China are few. Compared with South China, Northeast China is more vulnerable to “second-hand typhoons” (landing on land first and then moving into northeast China). On average, there are 1.2 Typhoons Affecting Northeast China every year on average. < p > < p > this year, under the guidance of subtropical high, both “Bawei” and “mesak” continue to move northward, and “Poseidon” also landed on the Korean Peninsula in a similar path, and then entered Northeast China with wind and rain. Three typhoons affected Northeast China one after another, showing a higher number than the annual 1.2. It should be emphasized that the damage will not be reduced after the typhoon reaches the northeast. When typhoon arrives in Northeast China, it will have a great impact on agriculture. As one of the main grain producing areas in China, a variety of autumn harvest crops in Northeast China are in the critical period of yield formation. Experts pointed out that although “Haishen” had turned into an extratropical cyclone in Jilin Province on the morning of September 8, and the Central Meteorological Station stopped numbering it at 8:00. However, the impact of wind and rain is still continuing, so it is suggested to consider the impact of disaster comprehensively. Global Tech