Abstract: The Beijing Proton Linear Accelerator (BPL) is tested in two energy steps,10 MeV and 35 MeV. The beam performance is reached the design values. Thebeam qualities, such as position, current, emittance, profile, energy and momen-tum spread were measured respectively by position monitor, current monitor,profile monitor, energy monitor and others placed in low energy beamtransport line. 10 MeV and 35 MeV measurement line. These monitors provideprecise and sufficicent information for operation and improvement of BPL. Themechanical design and its techology in manufacture for these monitors are descri-bed in this paper.