YVO4　nanoparticles　with　various　morphologies　were　tuned　directly　by　hydrothermal　treatment　in　different　solutions,　including　pure　water,　potassium　hydroxide　solution,　hydrazine　hydrate,　ethanolamine,　triethylamine,　and　pyridine.　X-ray　diffraction　(XRD),　Raman,　and　transmission　electron　microscopy　(TEM)　were　utilized　to　characterize　the　structure,　morphology,　and　size　of　the　products,　which　indicated　that　tetragonal　phase　YVO4　crystallites　displaying　rod-like,　square,　and　olivary　shapes　were　obtained.　It　was　found　that　the　selected　solvents　play　an　important　role　in　modulating　the　morphology　and　confining　the　size　of　the　obtained　products.