Offset　tracking　technology　is　widely　studied　to　evaluate　glacier　surface　displacements.　However,　few　studies　have　used　a　cross-platform　to　this　end.　In　this　study,　two　heterogeneous　data　sources,　Sentinel-1　and　Landsat　8,　from　January　2019　to　January　2021,　were　used　to　estimate　the　offset,　and　then　the　optimal　estimation　of　the　3D　deformation　rate　of　a　Himalayan　glacier　was　obtained　based　on　the　joint　model　of　variance　component　estimation.　The　results　show　that　the　maximum　deformation　rates　of　the　glacier　in　the　east-west　direction,　north-south　direction,　and　vertical　direction　are　85,　126,　and　88　mm/day,　respectively.　The　results　of　the　joint　model　were　compared　and　analyzed　with　the　results　of　simultaneous　optical　image　pixel　offset　tracking.　The　results　showed　that　the　accuracy　of　the　joint　solution　model　increased　by　41%　in　the　east-west　direction　and　36%　in　the　south-north　direction.　The　regional　flow　velocity　of　the　moraine　glacier　after　the　joint　solution　was　consistent　with　the　vector　boundary　of　the　glacier　cataloging　data.　The　time-series　results　of　the　glacier　displacement　were　calculated　using　more　images.　These　results　indicate　that　the　joint　solution　model　is　feasible　for　calculating　temporal　glacier　velocity.　The　model　can　improve　the　time　resolution　of　the　monitoring　results　and　obtain　further　information　on　glacier　characteristics.　Our　results　show　that　the　glacier　velocity　is　affected　by　local　terrain　slope　and　temperature.　However,　there　is　no　absolute　positive　correlation　between　glacier　velocity　and　slope.　This　study　provides　a　reference　for　the　joint　acquisition　of　large-scale　three-dimensional　displacement　of　glaciers　using　multi-source　remote　sensing　data　and　provides　support　for　the　identification　and　early　warning　of　glacier　disasters.