Low altitude Airspace resources has always been the development bottleneck of the general aviation industry, and is also one of the key factors in restricting the development of general aviation in China. Based on theoretical research and field research, the article constructs the evaluation index system for the availability of the low-altitude airspace resources, using the multivariate linear regression method to analyze the impact factors of the military and civil aviation which affect low altitude aviation resource, then determines the index weight at all levels. Taking Jiangsu province for example, the article analyzes the current situation of the available low altitude airspace resources in Jiangsu province. By summarizing the regional actual situations and the collected large amounts of data, through multiple linear regression, the results show the influence value of various different factors on the region, and finally draw a conclusion related to low-altitude airspace resource availability. The research results demonstrate that the method is scientific and effective, and provide a reference for rational use of China"s low altitude airspace resources and the declaration of general aviation airspace.