In　this　paper　the　phenomena　of　no　dehydration　and　phase　change　peak　in　TAP　(1)　and　TAP　(2)　crystal　under　35-100°C　have　been　verified　by　means　of　thermal　analysis.　Through　X-ray　diffraction　experiments　of　TAP　crystal　developed　under　40-50°C　and　50-70°C　respectivel,　it　was　found　that　the　diffraction　data　and　diffraction　parameters　of　above　two　specimens　have　a　rather　good　coincidence.　The　conclusion　is　that　no　dehydration　exists　in　TAP　crystal　under　40-50°C.