A light small digital X-ray optical imaging system based on the FPD (flat panel detector) is expounded for EOD (explosive ordnance disposal) field of static remnants (such as inside the suitcase) perspective imaging. The hardware of flat panel detector and point cone light source is designed in combination type to reduce the volume and weight of the system. Also, the images are output in direct digital way and the product integration is improved apparently. Through the image de-noising and filtering enhancement algorithm design, the clarity of the image and visual effect are improved. In the test and experiments, the system shows stable work and good performance. It can be widely used in the field of EOD field.