Soil expedient runway usually is used in humanitarian succor，force projection，logistic sustainment and non-war military operations. Based on the summarization of soil expedient runway structure design criteria research of US Army corps of engineers, a design method based on support aircraft, coverage, and CBR is introduced in this paper. Finally, an example for the design is showed on ×× aircraft, the result is simple, reliable and of some important value for the future research of expedient soil runway.