The last few years, many soil improvement methods have been applied in the highway construction in Vietnam, contributing to the decrease of construction time, project cost and quality. The soil improvement by vacuum preloading method (VCM) although is being applied in a variety of construction domains for such as factories, ports and industrial infrastructures, but it is not commonly used in highway constructions. This article will present experiences in applying the soil improvement by vacuum preloading method for expressway construction in Vietnam Expressway Corporation (VEC), the first Vietnamese company that applies this method in Vietnam.