a cooling module for use with a dmd module of a projection apparatus is provided . the cooling module comprises a heat conduction device , at least one heat pipe , and at least one fin . heat accumulating on the dmd module can be released from the heat conduction device to the fins through the heat pipe . meanwhile , the fins partially overlap along the direction of the light coming from the light source . thus , the fins can also prevent the unused light in the casing of the projection apparatus from leakage .