For　WC-6　wt　%　Co　and　WC-6　wt　%　Ni　composites,　and　by　using　five　parameter　analysis　method　as　a　new　approach,　the　geometric　and　crystallographic　features　of　carbide/carbide　boundaries　have　been　characterized.　Two　most　frequently　occurring　WC/WC　boundaries　are　90　degrees　twist　boundaries　about　[10-10]　(sigma　2　boundaries)　and　27.8　degrees　twist　boundaries　about　[0001]　(sigma　13a　boundaries),　the　sigma　2　boundary　populations　vary　with　binder　phase　types,　and　carbide　crystals　are　most　frequently　terminated　by　(0001)　and　(10-10)　surfaces,　such　preference　does　not　significantly　alter　if　sigma　2　boundaries　are　partitioned.