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In several decades,the world has witnessed various dramatic changes since applying of semiconductor.The performance requirements of semiconductor products are continue increasing while the technology is improving.In order to satisfy the requirements,the researches of new material and device structure is necessary.This paper shows a new structure of GaN HEMT.An AlGaN/GaN HEMT consists of AlGaN/GaN Heterojunction,drain electrode,source electrode and gate electrode.Though the researchers have reported a large number of HEMT structures since M.Asif Khan and his colleagues repot the first AlGaN/GaN HEMT in 1993,there is none of the structures,which three electrodes are in different surfaces of device.This paper describes a new structure called different-surface-gate structure,which drain and source electrodes are on the other surface while the gate electrode is on the top surface (AlGaN surface) of the device as normal HEMTs.This paper will establish two models by TCAD simulation software.One is the model of different-surface-gate AlGaN/GaN HEMT and the other one is normal structure AlGaN/GaN HEMT,which is the control model.After building the models,the compare of the models will show the saturation current of the different-surface-gate model is 120% as large as it of the other model.