Described is a new screened type of extracting/accelerating system thataccelerates ion beam up to 1.1mA and 180kV based on the requirements of high-yieldneutron tube. The optimization of structure has been realized and a neutron yield ofmore than 1.5×10~10n/s has reached. The long-term practices prove this physicaldesign is rational and lays a foundation for developing neutron tubes with still higheryield.