The axle housing manufactured by hydroforming can meet the requirement of light weight in automotive making. The products are of reasonable thickness distribution, high strength and rigidity. The application time of hydroforming axle housing in automotive manufacturing is not so long, its theory and process research is still not enough, accumulation of its experiences of test data and deformation regulation is rare, all this lead to difficulty in manufacturing design. Aiming at above problems, this thesis takes 1:2 scale samples of a 0.75t truck axle housing to hydroforming test and research, so as to search the regulation of axle housing hydroforming. By the use of different loading path in the two step of the processing, reasonable loading paths to the axle housing hydroforming are found. By the study of the broken tube, hydrorming limit diagram is drawn.