Important　role　of　melt-treatment　for　liquid　Al　and　theory　on　high　efficient　melt-treatment　as　well　as　key　techniques　were　expounded.　Furthermore,　effects　of　melt-treatment　techniques　such　as　high　efficient　purification,　modification　of　impurity-phase　containing　Fe-rich　and　grain　refinement　on　the　Al　melt　quality　and　interrelation　among　these　treatment　techniques　were　approached.　The　principle　of　melt-treatment　that　purification　is　a　key　process　of　Al　melt　treatment　and　base　of　refinement　and　modification　is　presented.　Based　on　the　principle,　high　efficient　melt-treatment　techniques　were　developed　to　be　applied　to　the　preparation　of　Al　sheets　for　the　can　with　high　performance,　which　can　significantly　improve　the　mechanical　properties　of　the　Al　sheets,　especially　the　ductility,　due　to　the　great　improvement　of　melting　quality　of　the　Al　sheets,　helpful　for　the　sequent　rolling　and　performance　of　the　finished　product.