Mammalian fauna was compared between a forest logged by conventional way (CL) and a forest logged by reduced impact logging (RIL) in Temengor Forest Reserve, Perak, Malaysia to identify the effects of logging on mammalian species assembly. We set 30 automatic cameras in a grid system around logging roads at each area. In total of 22 species of terrestrial mammals were photographed; 17 and 19 species were found in CL and RIL, respectively. Among them, 2 and 6 species in CL and RIL, respectively, were listed on the Malaysian Red List. Maxomys<i/> spp. and Niviventer cremoriventer<i/> increased with distance from logging roads. Leopoldamys sabanus<i/> were most abundant at an intermediate distance (100-150 m) from logging roads. Rattus<i/> spp. was only found in the vicinity of logging roads. Semi-terrestrial mammals such as squirrels and tree shrews were the most abundant around trees fallen by logging operation. As a result of these distributions of mammals, diversity index (H’) was the highest at an intermediate distance (100-150 m) from logging roads. These results suggest that we should construct logging roads at least 200-300 m apart each other and that RIL may be an effective method for conserving semi-terrestrial mammal communities because of its potential for providing complex forest structure for the mammals.