Abstract: It is the result of natural evolution that anearthworm with a multi-sectional non-smooth wavy surface can perfectly adaptits living environment. An earthworm moving in soil needs less longitudinalmuscle contract force and less energy than those required to move a similarsized cylindrical body. The computational analysis shows that such anearthworm body with the wavy surface can reduce its muscle contract force by1.12\%, and a similar amount of energy as well.