Abstract: To enhance preparedness for rainstorm disasters and improve prevention and mitigation capabilities, this study conducted a risk assessment and zoning plan for Taijiang County of Guizhou Province. Based on the disaster risk assessment theory of "hazard-causing factors-disaster-pregnant environment-disaster-bearing body-disaster prevention and mitigation capacity", we utilized the Analytic Hierarchy Process and Natural Breaks Method, combined with the actual conditions of Taijiang County in Guizhou Province, we established an assessment index system for rainstorm disaster risk comprising 4 first-level indicators and 17 second-level indicators, risk assessment and zoning were carried out by using GIS technology. The results revealed significant spatial differentiation in rainstorm disaster risks across Taijiang County of Guizhou Province, with risks categorized into four levels, extremely high, high, moderate, and low. The central urban area of Taijiang County was identified as an extremely high-risk zone. High-risk areas were concentrated in parts of Nangong Town in the south and Shidong Town in the north. Moderate-risk areas included sections of Laotun Township, while low-risk zones predominantly cover regions in Geyi Town, Taipan Township and Paiyang Township in the west, and Fangzhao Town in the east. Based on these findings, countermeasures were proposed including strengthening monitoring and early warning systems, improving emergency response mechanisms and promoting the construction of sponge cities. The research results can provide a reference for rainstorm disaster prevention in Taijiang County of Guizhou Province.