Abstract: A compact fast raising-edge X-ray system is designed according to the principle Marx generator. Marx and X-ray tube are integrally designed , and both of them are encapsulated in a stainless steel barrel of diameter of 15 cm, length 1.2 m. Marx generator is designed based on wave erection principle that has 15-stage, theoretical energy of 90 J and theoretical output voltage of 600 kV in coaxial structure. For a charging voltage of 30 kV per stage, the raising time of output pulse is below 10 ns at 360 kV into a 75 load with 40 ns pulse width. With a flash X-ray tube integrated directly into the generator as a load, the formed flash X-ray system could generate a dose of 2.5810-5 C/kg at 30 cm away for flash X-radiography with pulse width 35 ns. The size of x-ray source is 2 mm. The X-ray system has a stable performance, and it is easy to operate. It is the ideal tool for high-speed radiation photography.