A total of 27 typhoons were generated over western North Pacific and the South China Sea in 2017, of which 8 landed on the coast of China. The typhoons were generated mainly in July and August, whose origins were 5° to the west of previous average longitude. The number of typhoons generated over the South China Sea (8) was significantly higher than the annual average (4-7). The landing sites of these typhoons were concentrated on the coast of Guangdong. The cyclone peak intensity (30.9 m·s-1) was obviously weaker than the annual average (40.3 m·s-1), and the average landing intensity (29.0 m·s-1) was also weaker than the annual average (32.8 m·s-1). The typhoon rainwater was characterized by widespread rainfall area and enhanced heavy rain intensity,and major rivers-water levels were stable with several small and mediumsized rivers exceeding the warning level. Based on real-time operational track and intensity, precipitation and wind observations, combined with the hydrological observations, a detailed analysis was conducted of the meteorological and hydrological characteristics and socio-economic impacts of the 10 typhoon cases affecting China in 2017. HATO was the strongest typhoon that hit China in 2017, and it claimed the most affected population, deaths, missing persons and direct economic losses. It hit the economically developed and densely populated Pearl River Delta region followed by PAKHAR within 4 days, resulting in a doubled loss.