In order to meet the stability requirement of the waveform display of high-performance digital storage oscilloscope, this paper describes a display control circuit scheme of the Digital Storage Oscilloscope(DSO) which is built by the dual-port RAM IDT-70T3539M and EP1C4F324C8 as the main components, and discusses in detail the all functional modules within the FPGA and the preparation of the LCD-related driver. Comparing with the former display plan，this plan can meet better the performance requirements of the waveform display of the oscilloscope. The plan can achieve the update rate of waveform for the 2 000 waveforms/s，supporting a resolution of 640×480 and 18 bit color TFTLCD，and can achieve a variety of display.