Mid-Infrared supercontinuum is generated, using a germanium-doped silica fiber pumped by a Q-switched thulium-doped fiber laser. We obtained a relatively flat supercontinuum output in the range of Mid-Infrared by optimizing the length of the germanium-doped silica fiber and splicing a multi-mode fiber to improve the spatial coupling efficiency and damage threshold of the pump light. The long wavelength limit is close to the maximum of reported germanium-doped fiber based supercontinuum generation.