A computer with good refrigeration performance comprises a side wall, a plurality of rectangular blind grooves are formed in the side wall towards the interior of a computer shell, the rectangular blind grooves comprise five walls which are the top wall, the bottom wall, the first side wall, the second side wall and the rear wall respectively, and particle impurity filter membranes are installed in the first side wall and the second side wall and on one or more walls. The defect that in the prior art, many particulate matter impurities are deposited in the machine shell is overcome.