By analysis of the path, the gale disaster, and the general circulation of typhoon Inbudo, it shows that ①the subtropical high moves westwards and leads the typhoon to move westwards for a stable period, ②the gale disaster is due to the rise of the pressure gradient between the subtropical high and the typhoon,③the southwest jetstream in tropic brought abundant vapor and instability energy to Guangxi is the main reason of the heavy rainfall.