Two　different　thicknesses　of　CuCrZr　plates　combined　with　laser　deposited　V　layer　were　designed　as　a　composite　intermediate　layer　to　laser　welding　of　TC4　alloy　to　304　stainless　steel　(SS).　The　effect　of　different　thicknesses　of　CuCrZr　plates　on　microstructure　and　mechanical　properties　of　Ti/steel　welded　joint　was　investigated.　The　results　show　that　a　sound　Ti/steel　joint　with　full　penetration　has　been　successfully　achieved　using　the　prepared　composite　interlayer.　When　the　thickness　of　CuCrZr　plates　was　increased　to　1　mm　from　0.5　mm,　an　unmelted　CuCrZr　zone　was　observed,　which　hindered　the　diffusion　of　Fe　and　V　elements.　A　small　amount　of　clustered　FeV　intermetallic　compounds　(IMCs)　were　found　in　fusion　zone　(FZ)　with　0.5-mm-thick　CuCrZr　plates;　however,　no　sign　of　IMCs　formation　was　observed　in　FZs　using　1-mm-thick　CuCrZr　plates.　Compared　to　0.5-mm-thick　CuCrZr　plates,　the　application　of　1-mm-thick　CuCrZr　plates　resulted　in　a　more　uniform　hardness　distribution　of　the　FZs,　as　well　as　stronger　ultimate　tensile　strength　(415　MPa)　and　elongation　(5.2%).　In　addition,　the　most　important　feature　was　that　the　fracture　of　the　joint　with　1-mm-thick　CuCrZr　plates　occurred　in　the　unmelted　CuCrZr　zone　rather　than　in　the　FZs.