Abstract: Using geotechnical engineering methods to resolve technical difficulties in construction processes may appears to be a common approach, geotechnical construction workers may found it challenging to apply such method to work due to their diverse backgrounds and lacking of experiences. Based on the analyses of the Geotechnical Investigation Report of a Plant in Yunnan Longling and on-site observations of the distinctive foundation soil expansion due to water absorption, this paper further discussed the component of the thick fill to be disposed and the characteristics of the expansive soil at the location. This paper also proposed a dynamic compaction approach of "compacting while removing, timely filling, case by case treatment" which can effectively resolve the construction difficulties caused by expansive soil during rainy season and the problem of unable to dispose large scale thick soil. The proposed approach will eventually shorten the construction period as well as reduce the cost which provides theoretical value and practical significance to similar projects.