Influence　of　homogenization　on　morphologies　of　the　precipitated　phases　in　Al-1Mn-1Mg　alloy　prepared　by　high-efficient　melt-treatment　was　studied　by　means　of　SEM,　TEM,　EDAX　and　DTA.　The　results　show　that　the　phases　precipitated　on　the　grain　boundary　are　mainly　compound　phase　Al　(Fe,　Mn,　Si,　RE).　These　precipitates　turn　into　spherical　shape　gradually　with　the　increasing　of　temperature　in　the　range　of　400-600°C　or　the　extension　of　holding　time　in　the　range　of　6-24　h.　The　dispersity　of　precipitates　with　different　components　and　different　morphologies　within　the　grains　increases　with　increasing　annealing　temperature　and　holding　time.　The　phases　on　gram　boundary　become　coarsening　while　increasing　temperature　or　elongating　holding　time　continuously.　An　optimum　microstructure　of　the　alloy　can　be　obtained　by　annealing　at　450-500°C　for　12-15　h.