Research　purposes:　Transparent　sand　is　a　new　type　of　geotechnical　engineering　material,　which　is　made　of　fused　silica　sand　and　porous　liquid　with　the　same　refractive　index.　In　order　to　understand　its　mechanical　properties,　the　CU　and　CD　tests　of　fused　silica　sand　with　a　particle　size　of　0.5~1.0　mm　and　1.0~3.0　mm　are　carried　out　by　triaxial　apparatus,　and　the　stress-strain　curves,　pore　water　pressure　changes　and　effective　stress　ratio　of　the　two　are　compared　and　analyzed.　In　addition,　E-μ　model　parameters　of　coarse　and　fine　sand　are　calculated　respectively,　which　provide　corresponding　parameters　for　further　numerical　calculations.　Research　conclusions:(1)　The　loose　sample＇s　stress-strain　curve　shows　hardening　characteristics.　(2)　The　coarse　particle　specimen　with　steeper　stress-strain　curve　comes　to　the　peak　at　faster　velocity　than　fine　particle　specimen.　(3)The　pore　pressure　value　of　the　coarse　particle　specimen　is　greater　than　the　fine　particle,　the　pore　water　pressure　coefficient　of　the　two　shows　a　decreasing　trend　with　the　increase　of　the　confining　pressure.　(4)　Transparent　sand　can　be　used　to　simulate　natural　sand　and　the　change　of　diameter　can　represent　different　soils.　(5)　The　research　results　can　provide　reference　for　model　tests　based　on　transparent　soil　technique.　©　2018,　Editorial　Department　of　Journal　of　Railway　Engineering　Society.　All　right　reserved.