In order to meet the storage speed of real time none compressed large area CCD camera, after analysis the character of digital signal and SCSI data transmission procedure, a method is presented which produce two image data by using FPGA, one of image data are written to SCSI disk array on DMA mode by SCSI controller, the other image data are send to memory by PCI interface and realtime display. The insufficient of traditional storage scheme is pointed, and the DMA technology solves this question. The access time of SCSI disk and the effect of storage speed by size of data block are analysis. Because of the nature image data don’t pass the PCI interface the storage speed improves very much, this method meets the requirement of large capacity image record and realtime display. Experiments results show that the system works under by a 2K×2K image with 25 f/s, the storage speed reaches 1 200 Mb/s, the system works stable and correct results make this method very ascendant in practical application.