Abstract: Tropical cyclones （also known as hurricanes or typhoons） are among the most destructive natural disasters globally, causing hundreds of fatalities and tens of billions of RMB in economic losses annually. Existing data indicate that global climate change has slowed the translation speed of tropical cyclones, and an inverse relationship exists between translation speed and cyclone-induced rainfall. Furthermore, while the global total number of tropical cyclones shows a declining trend, the frequency of Category 4~5 hurricanes （i.e., super typhoons） has exhibited an overall increase. The 2017 Atlantic hurricane season caused economic losses of 125 billion in the United States; in 2025, a hurricane in Texas, USA, triggered heavy rainfall, resulting in over 130 fatalities. Hainan is located along the core generation and movement path of typhoons, making it one of the regions in China most frequently affected by these storms. In 2014, Super Typhoon "Rammasun" made landfall in Wenchang, Hainan, becoming the strongest typhoon on record to strike China （landfall intensity 70  m·s⁻¹）. It caused 24 deaths or missing persons on Hainan Island and direct economic losses of 11 billion RMB. In 2024, Super Typhoon "Yagi", with a landfall intensity second only to "Rammasun" （62  m·s⁻¹）, similarly made landfall in Wenchang, Hainan. However, its destructive impact far exceeded that of "Rammasun", causing 4 deaths and direct economic losses exceeding 60 billion RMB on Hainan Island.Super Typhoon "Yagi" （international designation: 2411） formed over the ocean east of the Philippines on September 1, 2024, and made landfall along the coast of Wengtian Town, Wenchang City on September 6 （minimum central pressure 915 hPa）. It then crossed Haikou and Chengmai before moving into the Qiongzhou Strait and subsequently entering the Beibu Gulf. The area on Hainan Island covered by force 12 and above winds was affected for over 9 hours, far exceeding the 3 hours during Super Typhoon "Rammasun" in 2014. The minimum pressure and maximum wind speed recorded in Wenchang both broke all previous land-based observational records for typhoons in China. From September 4 to 8, Hainan Island experienced widespread heavy to torrential rain, with a maximum accumulated rainfall of 691.2 mm at Jianfeng Town, Ledong County. Wenchang's precipitation broke its historical daily maximum rainfall record for September. In Haikou City, more than 100,000 people were evacuated, about 400 houses collapsed, over 30,000 houses were damaged, the crop-affected area reached 570 km², and direct economic losses exceeded 2.6 billion RMB. In Wenchang City, more than 25,000 houses were damaged, the crop-affected area was about 180 km² （with 110 km² of total crop failure）, and economic losses amounted to approximately 32.7 billion RMB. In recent years, Hainan Province has significantly improved its typhoon defense capabilities by revising engineering construction and equipment-use standards and refining pre-disaster emergency plans, leading to a notable reduction in casualties. However, with continued population and economic growth in coastal areas, the risks posed by super typhoons continue to rise, and the resulting economic losses are becoming increasingly difficult to bear.Worldwide, foundational theories and forecasting research on the generation and development of tropical cyclones from a meteorological perspective have been well-established, and related findings have played a significant role in reducing tropical cyclone disasters. However, the occasional occurrence of landfalling super typhoons and their marked regional variability have resulted in relatively limited research on their powerful dynamic impacts on the ground. There is still a lack of sufficient data and experience to systematically reveal their disaster-causing mechanisms, and mature solutions for adaptation and disaster prevention and mitigation strategies have yet to be formed. As a fundamental means for major disaster assessment and scientific research, systematic field investigations are crucial. Following the passage of Super Typhoon “Yagi” across Hainan in 2024, the school of Civil Engineering and Architecture of Hainan University organized an interdisciplinary typhoon disaster investigation team composed of nearly one hundred faculty and students. The team conducted field surveys in the affected areas for over ten days. The survey covered regions within the force 10–17 wind circles of Super Typhoon “Yagi” and focused on nine categories of buildings and structures that showed obvious damage (building envelopes, high-rise buildings, tall/steel structures, temporary buildings, agricultural greenhouse buildings, road infrastructure, photovoltaic structures, power and communication facilities, wind power generation systems), as well as coastal erosion and treefall conditions. More than 1,000 individual structures/sites were surveyed. A multi-source “air-space-ground” data acquisition approach was adopted: field studies were carried out to collect background information and record structural damage patterns and severity; handheld laser rangefinders and accelerometers were used to quantify damage parameters; satellite remote sensing and UAV aerial imagery were employed to analyze coastal erosion and treefall; questionnaire surveys and subjective perception assessments were applied to quantify wind-induced vibration comfort in high-rise buildings. For data processing, most surveyed objects were classified according to function, location distribution, and other characteristics, and disaster losses were graded to summarize damage patterns. Representative cases were selected for in-depth analysis of disaster causes. The investigation received support and guidance from the Hainan Meteorological Service, Hainan Provincial Department of Housing and Urban-Rural Development, Hainan Provincial Department of Transportation, Hainan Provincial Department of Emergency Management, and Hainan Provincial Department of Natural Resources and Planning. Substantial assistance during field visits and data collection was provided by the People’s Government of Dongying Town in Lingao County, Shuichongpo Village in Ding’an County, Gengdushanfang, and the Mei’ao Village Committee. Enterprises including Hainan Xinyi Mining Co., Ltd., Hainan Zhelian Steel Structure Group Co., Ltd., Hainan HNA-Energy China Engineering Co., Ltd. （or: Hainan HNA-China Energy Engineering Co., Ltd.）, Wenchang Luneng Hilton Hotel, Hainan Zhipu Agricultural Technology Development Co., Ltd., and Hainan Yabang Integrated Housing Co., Ltd. also offered active cooperation and support.The investigation results show that many meteorological stations recorded wind pressures exceeding the design load standards for buildings, and wind-speed amplification due to topographic effects was observed in some areas. For instance, the high-rise building cluster near Haikou Bay experienced a local wind-speed increase of 20%–30% due to the Venturi effect; the peak dynamic wind pressure on windward building envelopes exceeded 5 kPa （nearly 50% above the design load for conventional buildings）. Existing building envelopes, temporary structures, power facilities, and agricultural greenhouse buildings exhibited insufficient resistance to super typhoons, indicating an urgent need to revise relevant construction codes in typhoon-prone regions. The sandy coastline in Wenchang showed shoreline retreat on the order of meters, necessitating heightened attention and the formulation of long-term protection strategies. Secondary hazards such as heavy rainfall and treefall severely impacted the service life of highways and urban roads; resilience should be enhanced through improved drainage systems and roadside tree planning. Treefall patterns were directly related to geographic location, surrounding built environment, and tree species; rational spatial planning can help reduce disaster losses. The disaster prevention and emergency response to Super Typhoon “Yagi” once again demonstrated that securing communications, transportation, and water/power supply is central to emergency management and plays a key role in reducing losses and casualties. It is therefore essential to strengthen relevant standards and promote the application of new disaster prevention and mitigation technologies in these sectors. The impact area and damage severity of super typhoons are directly linked to geographical location, topography, land use and other factors, exhibiting marked regional characteristics. Given that the two strongest typhoons on record to strike China both made landfall in Wenchang, Hainan, causing enormous economic losses to Hainan Island, it is recommended to establish a Typhoon Disaster Prevention and Mitigation Research Center on Hainan Island. Such a center would systematically investigate the occurrence patterns of typhoon disasters, innovative technologies for disaster prevention, avoidance, mitigation and post-disaster recovery, as well as related laws, regulations and policy measures, while fostering international exchange and cooperation to support scientific decision-making by the government.