The　effect　of　pre-loading　on　the　compressive　behavior　of　a　ductile　Cu48Zr48Al4　bulk　metallic　glass　composite　(BMGC)　containing　a　B2-CuZr　phase　was　investigated　by　a　lateral　pre-compression　method.　It　was　found　that　noticeable　plasticity　and　fracture　strength　degradations　occurred　for　the　BMGC　after　the　lateral　pre-compression.　The　degraded　mechanical　properties　of　the　BMGC　were　correlated　with　the　martensitic　transformation　from　B2-CuZr　phase　to　B19＇-CuZr　phase　induced　by　the　pre-compression.　Based　on　the　compressive　behavior　of　the　B2-CuZr　and　B19＇-CuZr　phases,　influences　of　the　two　crystalline　phases　on　the　shear　band　multiplication　in　the　BMGC　were　compared.　It　is　expected　that　the　pre-martensitic　transformation　of　the　B2-CuZr　phase　during　the　pre-compression　would　reduce　the　contribution　of　the　martensitic　transformation　on　the　mechanical　properties　of　the　BMGC　during　subsequent　compression,　causing　degradations　of　its　plasticity　and　work-hardening-like　characteristics.　The　results　suggest　that　mechanical　prehistory　of　the　CuZr-based　BMGC　may　be　an　important　factor　on　its　subsequent　mechanical　behavior.　(C)　2013　Elsevier　B.V.　All　rights　reserved.