Abstract: A new software,of EPG technique,Realdisplay,was developed for the study of feeding behavior of piercing-sucking insects on plants.The new software could divide,according to the users will,the monitor screen into several parts,each simultaneously displaying the EPG signals of the specific channel and sampling frequency.The researcher could exactly and simultaneously know and control the insect feeding behavior.The voltage at each moment is deposited,therefore,it is convenient for the following analysis and statistics.The software strengthens the function of EPG technique and expands its application field.It provides a useful tool for the study on the details of feeding behavior of piercing-sucking insects on plants,and for the study on the interaction among the insect,virus and the host plant.