Abstract: In the first place, the general method of graphical interface is analysed in the paper, the designtechnigue of some subroutines (text characters, multiplelayer pull-down menu, multiple windows,etc. ) is put forward. By given a actual package used in safeguards NDA system finally, it shows thatthe software system is better than the current international packages in friendly interface, spectrum dy-namical display and plotting. The algorithms of software design are suitable for not only general nuclearspectrum acquisition and analysis system, but also general microcomputer graphical interface design.