In order to measuring the quantum efficiency (QE) of a microchannel plate (MCP)
a method advanced was to measure the current transmited from the MCP indirectly by measuring the voltage directly. The Extreme Ultraviolet radiation was firstly calibrated by a transferred standard detector and then illuminated the MCP
the current from the MCP was measured and the QE of the MCP was compputed in 12nm~40nm. The rusult indicated that the value of the QE was from 2% to 12.3% in above wave band and dropping with increasing wavelength. Finally