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Reflex light-tubes have been widely used in optoelectronic measuring systems such as ships,vehicles.etc.It can make the optical path reflexes in altitude-direction and keep the incident light parallel to the emergent light in azimuth transmission.So it ensures precision transmission of the azimuth reference.The flat mirror method and the mercury method have been used to test the optical-axis parallelism of reflex light-tubes short than l m,however both the methods can not meet the accuracy required when they are applied to reflex Light-tubes longer than 3 m.A new test method of optical-axis parallelism for three-meter reflex light-tube is introduced and it can be well suited for testing parallelization of reflex light-tubes more than 3m.