In order to decrease the discharge of pollutants from heavy highway trucks and dependence of nonrenewable resources, a propulsion system for highway trucks was established based on the electric propulsion technology of overhead contact lines; and those key technologies and problems for power supply to heavy trucks were put forward for application of overhead contact lines. It was found that application of the electric propulsion system of overhead contact lines for heavy trucks may lead to the good effect of energy saving and emission reduction and some certain economical efficiency based on comparison with those effects for traditional ones. Moreover, such technology may be applicable to some large passenger cars in relatively smooth highways such as national roads.