By　virtue　of　five　parameter　analysis　(FPA)　method,　the　grain　boundary　character　distributions　(GBCDs)　were　measured　for　both　Sigma　13a　and　Sigma　2　coincidence　site　lattice　(CSL)　boundaries　in　WC-Co　composites　under　plastic　deformation　condition.　For　the　two　CSL　boundaries,　compared　to　the　cases　in　the　undeformed　sample,　both　their　populations　and　their　habit　plane　occurrence　frequencies　decrease　in　the　plastically　deformed　sample.　The　interpretation　about　the　GBCD　evolution　during　plastic　deformation　is　proposed　based　on　the　analysis　of　fine-sorted　crystallographic　plane　categories.