The　materials　of　dry-mixed　mortar,　has　been　largely　used　as　the　development　of　energy　saving　building　and　environmental　protection.　So　understanding　the　mixed　characteristic　and　disciplines　of　this　materials,　which　can　instruct　production　and　practice,　becomes　more　and　more　important.　This　article　indicates　the　mixing　degree　of　dry-mixed　mortar　by　pyoktanin　blue　method,　researches　the　mixing　effect　by　drum-type　blending　machine.　And　also　together　with　the　basic　discipline　curves,　the　article　analyzes　the　mixing　effect　by　mixing　time,　rotation　speed,　sand　of　modulus　fineness,　loading　factors,　etc.　The　research　shows　the　degree　of　mixing　changes　periodically　as　mixing　time　changes.　But　all　of　rotation　speed.,　sand　modulus　fineness　and　loading　factors　have　extreme　points　on　the　curves,　the　points　mean　the　best　mixing　effect　for　the　material.