The　precursor　powder　of　freeze　drying　was　investigated　by　means　of　X-ray　diffraction　and　scanning　electron　microscopy.　The　＇segregation　of　solute　model＇　is　established　and　discussed.　The　results　show　that　the　precursor　powder　is　amorphous　with　a　smooth　surface.　The　morphology　of　powder　is　flaky,　club-shaped　and　a　little　hexagonal.　In　the　low-temperature-freezing　stage,　the　water　is　frozen　as　ice　phase,　while　the　solute　precipitate　as　the　salt　phase.　In　the　temperature-raising　stage,　the　amorphous　ice　would　crystallize.　The　micro-crystal　would　segregate　at　the　process　of　ice　crystallization.　Because　the　morphology　and　the　size　of　the　ice　crystal　are　different,　the　amorphous　powder　forms　differently.　When　the　concentration　of　the　solution　is　high,　the　main　amorphous　powder　is　flaky　and　club-shaped,　and　it　appears　hexagonal　pattern　when　the　concentration　is　low.