2022年第4号台风“暹芭”于7月2日夜间进入广西后路径突然向北转折，导致风雨预报出现较大偏差，对台风防御工作造成严重影响。本文利用高空、地面、卫星等多源气象观测资料以及ERA-Interim再分析资料分析造成台风“暹芭”登陆后路径异常北折的主要原因。/t/n（1）呈现双脊线形态的西太平洋副热带高压与西风脊叠加加强西伸产生气压梯度加大、偏南风加强是导致“暹芭”台风路径突然北折的主要原因；（2）高空西风槽前及南亚高压西北侧的西南气流与台风出流相连接，形成的高层北向出流有利于“暹芭”台风北上；（3）850hPa风场呈现不对称结构，强风速区向“暹芭”台风中心东侧转移，导致偏北向分量加强；（4）在路径转折之前，深层纬向平均引导气流出现0m·s^-1的转向信号，西风和南风分量的快速增强引导“暹芭”台风向北移动；（5）正涡度平流的变化对“暹芭”台风路径的北折有指示意义，台风倾向于向正涡度平流的大值区域移动；（6）位涡倾向正值中心能够较好地指示台风路径北折过程，“暹芭”台风的转向主要受水平平流项和垂直平流项的共同影响，水平平流项起主导作用，台风外部大尺度环流是导致其路径北折的主要原因。

In 2022, Typhoon "Chaba" entered Guangxi during the night of July 2nd. Its track suddenly turned northward, resulting in significant deviations in wind and rain forecasts and exerting a severe impact on the typhoon defense efforts.Using utilizes multi-source meteorological observation data such as upper-air, surface, and satellite data and E ERA-Interim reanalysis data, to analyze the main causes for the abnormal northward turn of Typhoon "Chaba" after its landfall.The results show that: (1) The superimposition and strengthening of the Western Pacific subtropical high pressure with a double-ridge line pattern and the Westerly ridge, which extended westward and formed a northward guiding airflow, was the primary reason for the sudden northward turn of the typhoon track of "Chaba". (2) The southwest airflow in front of the upper-level Westerly trough and on the north side of the South Asian high-pressure monomer was connected to the outflow of the typhoon, forming an upper-level northward outflow that facilitated the northward movement of Typhoon "Chaba". (3) The 850 hPa wind field exhibited an asymmetric structure. During the northward turn of the track, the strong wind speed area shifted to the east side of the typhoon center, while the northward component intensified. (4) Before the track turned, a turning signal of 0 m·s-1 appeared in the deep zonal average guiding airflow. The rapid enhancement of the westerly and southerly components led to the northward movement of Typhoon "Chaba". (5) The change in positive vorticity advection was indicative of the northward turn of the typhoon track of "Chaba", and the typhoon tended to move towards the area with a large value of positive vorticity advection. (6) Positive vorticity centers tend to indicate better the process of typhoon path northward bending. The turning of Typhoon "Chaba" was mainly influenced by the combined effects of the horizontal advection term and the vertical advection term, with the horizontal advection term playing a dominant role. The external large-scale circulation of the typhoon was the main reason for its path northward bending.