Abstract: Compared with the disaster prevention and reduction planning of park green space system in city, the planning of small town's park green space system cannot simply replicate the experience of city, because of its particularity in the aspects of scale, site selection, population, economy and industry. Therefore, the key point of this study is to build a set of suitability evaluation index system that is coordinated with the disaster prevention and reduction planning of park green space system in small towns. Based on the development characteristics of small towns, this paper constructs the evaluation index system of the suitability of park green space system for disaster prevention and reduction in small towns, and uses ArcGIS to build an analysis database to evaluate the suitability of disaster prevention and reduction of park green space system in Qianxi county. The results show that the planning of park green space system in Qianxi county needs to be further improved. Although the number of park green spaces has reached the standard, the spatial relationship between park green spaces and social environment and disaster environment in small towns has not been fully considered. The evaluation results not only provide basis for disaster prevention and reduction planning of park green space system in small towns, but also have important significance for the improvement of disaster control ability in small towns.