Cu is used as the mesosphere material in the experiment, and the diffusion-bonding experiment of Be/Cu/HR-1 stainless steel is made on the Greeble1500 hot stimulation test-machine. The interface characteristics of the diffusion bonding are studied by means of the Scanning Electron-Microscope, the X-ray Diffraction and the HV-1000 Micro-hardness Tester. The results show that Cu can countercheck the mutual diffusion between Be and Fe, as well as the diffusion of Ni and Cr from the stainless steel to Be, resultingly, restrain the formation of the intermetallic compounds among them, but the Be_(2)Cu is formed because of diffusion of Cu, and the intermetallic compounds is firstly formed along grain boundry and distributed as net-like, and the diffusion of elements is made along the grain boundry and their diffusion is non-uniform, and also does not form the layer of the single intermetallic compound. The fracture of the sample lies at the Be/Cu interface area.