Abstract: The deformation characteristics of copper tube with guard ring under two head-on collision detonation waves were experimentally researched. High-speed frame photography, pulsed X-ray radiography and VISAR interferometer were employed to record the expanding process, radius history and velocity history of the copper tube with guard ring. Experimental results show that guard ring can postpone the collision region shell to rupture. The jet-shaped protuberance was found on collision region of copper tube with guard ring. The jet-shaped protuberance consisted of mass ejection from free surface of copper tube and air shock. The DYNA3D code was utilized to simulate the expanding process of copper tube with guard ring. The calculated results and the experimental results are coincident. The LS-DYNA3D code was used to analyze the influence of guard rings fillet on deformation characteristics of metal tube.