La2O3-Nb2O5 glass has prospective applications in optical devices such as endoscopes, camera, microscope and so on. Containerless solidification is a suitable technique to vitrify the materials with low glass-forming ability. But only millimeter scaled amorphous products can be obtained by this method, which severely limits the application of these new glasses. To solve this problem, we proposed a synthetic route to get large-sized glass via hot-press sintering of amorphous oxides at the temperatures in the kinetic window (?Tx). First, amorphous oxide was made by containerless solidification technology. Then, under the external pressure, amorphous oxides powders were hot-press sintered in ?Tx when the glass appears superplastic. The influences of sintering pressure and temperature on the densification process were investigated. The results showed that, the samples have higher density and demonstrate significant densification when the sintering pressure was improved from 60 MPa to 200 MPa. The shrinkage process consisted of three stages, including accelerating shrinkage, rapid shrinkage and shrinkage stagnation. Under the pressure of 200 MPa, the sintering temperature is very low as 710 ℃ and the increasing sintering temperature could promote the densification, demonstrating the moderate and swift features of this synthetic approach.