Abstract: This paper introduced a design of high-resolution digital X-ray detection system used in electronic industry. According to the requirement of the design, this paper put forward the overall scheme of the system，researched and selected the micro-focal spot X-ray source and double proximity focusing X-ray intensifier as the key devices in the system, analyzed the influence on the final resolution caused by their own resolution of micro-focal spot X-ray source, double proximity X-ray intensifier and the system magnification. It designed the light path, image acquisition device and acquisition software, developed a complete imaging system prototype, and carried out debugging and experiment on it ,then completed the practical X-ray image processing software by using VC 6.0. Results show that the effective vision of this imaging system achieves up to 75 mm, and the resolution is 160 lp/cm.