a computer housing includes a front plate , a front panel and a fixing mechanism for the front panel . the front plate has at least two holes . the front panel has at least two engaging slots corresponding to the holes . the fixing mechanism includes two hooking plates and at least two springs . the hooking plates are slidably disposed on an inner side of the front plate . each of the hooking plates has at least one hook passing through the hole to limit the hooking plate slidably between a first position and a second position . the spring connects the hooking plate and the front plate . the elasticity of the spring enforces the hooking plate and the hook abuts one edge of the hole to maintain the hooking plate on the first position .