Abstract: Four current monitors have been developed at CIAE. They are used to measure relativistic electron beams in a large area diode. Two Rogowski coils with a rectangular frame can be used to monitor electron beam currents without interrupting them. A shunt is made of stainless steel foil with a thickness of 15μm. It is set between two sections of outer cylinder of the Blumlein line. The shunt has a much longer lifetime than that made of carbon or metal film resistors.