Self propelled telescopic boom lift GTBZ can drive flexibly and freely, with wide working scope and high efficiency. Hydraulic motor realize 40% gradeability through planetary reduction box. Telescopic boom and cylinders are protected with dust proof jacket to prevent dust in. The round glossy shape boom and chassis is not easily dirty with dust. Length and angle of boom are monitored real time by length sensor and angle sensor. Protection level of electrical system is above IP65. With great outreach, the boom lift can work in large scope continuously. 2 wheels drive and 4 wheels drive, 2 wheels steering and 4 wheels steering are optional. It is especially good for shipbuilding, ship maintenance, building construction, steel structure fixing, and bridge construction and so on.