Abstract: The basic principle of static CT technology was introduced. The cold cathode X-ray source based on super-aligned carbon nanotube technology, multi-energy spectrum X-ray imaging technology based on photon counting technology and image reconstruction algorithm of static CT system were studied. The cold cathode X-ray source which can work stably under 130 kV is composed of a cold cathode X-ray tube based on super-aligned carbon nanotube technology, two sets of high-voltage systems and a control system. A photon counting X-ray detector system with three-energy spectrum imaging function was developed and tested. The image reconstruction algorithm of static CT system was discussed, and a feasible method was proposed. The research on the key technology of static CT system for security inspection provides a technical basis for its development.