Abstract: The production and transportation of heavy oil are very difficult because of its high density and viscosity. Many technical and economical problems should be solved to improve the transportation meth-ods. The technical conditions of transportation of Hekou Heavy Oil by mixing with water are studied through a testing loop in the laboratory and a field testing pipeline. According to the tests and calculations, it could be concluded that transporting heavy oil by mixing with water is an economic method of heavy oil transportation.