W-Cu　composite　materials　are　widely　used　in　civilian　industries　and　aerospace　fields　owing　to　their　integrated　properties　of　high　hardness,　wear　and　arc　resistance,　electrical　and　thermal　conductivities,　and　low　coefficient　of　thermal　expansion.　The　recently　developed　submicron-　and　nanostructured　W-Cu　composites　exhibit　superior　performance　compared　to　their　conventional　coarse-grained　counterparts　and　are　expected　to　further　expand　applications　of　this　group　of　materials.　This　review　is　focused　on　recent　important　progress　in　the　preparation,　characterization,　and　mechanical　and　physical　properties　of　W-Cu　composites　with　refined　structures.　We　summarize　the　technologies　that　are　capable　of　refining　component　structures　and　evaluate　their　advantages　and　limitations.　Furthermore,　the　effects　of　component　refinement　and　additives　such　as　alloying　elements　and　dispersed　particles　on　the　comprehensive　performance　of　W-Cu　composites　are　demonstrated.　At　the　end　of　the　review,　we　propose　potential　research　issues　and　directions　worthy　of　attention　for　the　future　development　of　W-Cu　composites.