Based　on　Coupled　Eulerian　and　Lagrangian　(CEL)　method,　a　modified　dynamic　viscosity　formula　varying　with　temperature　is　proposed　for　simulation　of　high　temperature　Yttria-Stabilized　Zirconia　(YSZ)　droplet　solidification　process.　The　fluid　structure　coupling　finite　element　model　is　established　by　using　Lagrange　element　to　describe　the　substrate　and　Euler　element　to　describe　the　droplets.　The　numerical　simulation　shows　the　propagation　morphology　of　droplets　on　the　substrate　and　the　variation　of　propagation　coefficient　with　time.　Compared　with　the　experimental　results,　the　model　and　the　modified　formula　are　reliable.　This　paper　provides　a　theoretical　basis　for　the　application　of　high　temperature　plasma　spraying　to　prepare　thermal　barrier　coatings　in　engineering.　©　2022　SPIE