Coherent　beam　combining　of　fiber　lasers　has　the　capability　of　scaling　to　unprecedented　power　with　near-diffractive-limitation　beam　quality.　Aperture　technology　is　the　key　factor　of　Coherent-Beam-　Combining　(BCB).　This　paper　summarizes　and　analyzes　the　present　level　and　the　significant　progress　of　aperture　technology　for　coherent　beam　combining,　including　its　principle　and　characters.　Accordingly,　we　classify　the　aperture　technologies　and　highlight　their　predominance　respectively.　Moreover,　some　development　trends　are　explored.