Spectral beam combining is an effective way to realize high brightness direct semiconductor laser output. A hundred watt level spectral beam combining scheme based on mini-bar stack is demonstrated. Due to the lower “smile”effect of mini-bar and equal beam quality in both axis of mini-bar stacks, this mini-bar stack based spectral beam combining scheme have more effective optical feedback compared to the standard cm-bar based spectral beam combining scheme. A cylindrical mirror as the output mirror to restrain the cross-talk between emitters is utilized instead of using a traditional spatial filter, which will also lower the system size. A spectral beam combining output of 159 W is achieved, with an electro-optical efficiency of 47.35% and spectral width of 11.97 nm. At the operating current of 60A, the beam quality of 3.145 mm · mrad (fast axis) and 3.554 mm · mrad (slow axis) is demonstrated by spectral beam combining.