Abstract: A method is introduced to drive the bargraph display devices directly with microcontroller.The double bargraphes in which have 101 lines are driven directly with the method of dynamic scanning.The bit of decade is named code of segment,and bit of the unit is named as number of line.The segment corresponding to the segment code is named current segment,and the segments which their codes are subtracted by one and lower is called segments displayed fully.Shutting display means shutting down two bargraphes.