The objective of this study is to get insight into the influence of interfacial void morphology on the shear strength of similar diffusion bonded stainless steel hollow structural components. For the fixed temperature and pressure, three kinds of surfaces and various bonding times were applied to obtain the same interface bonding ratio but different interfacial void morphologies. The result showed that the bonding couples with smoother surfaces require less bonding time than those with rougher ones to achieve the same interface bonding ratio, and in this study the sound joint with the maximum shear strength of 761 MPa can be fabricated at 950 °C, 10 MPa and 15 min for the smoothest surface ground by 2000# SiC paper. At the low interface bonding ratio, void morphology has an obvious influence on the shear strength of joint, in which the large-size irregular voids produced by rougher surfaces significantly decrease the shear strength of joint. As the interface bonding ratio increases, the void morphology effect on shear strength of joint gradually weakens. When the high interface bonding ratio of 90% is achieved, the void morphology effect on the shear strength of joint is slight.