The thermal stability, Raman spectra, and upconversion luminescence spectra of lead halide-modified Tm3+/Yb3+-codoped tellurite glasses ha ve been investigated, and the upconversion luminescence mechanism of Tm3+/Yb 3+-codoped oxyhalide tellurite glasses were analyzed. The results sho wed that mi xed lead halide-modified Tm3+/Yb3+-codoped tellurite glass es possess good thermal stability, low phonon energy and intense upconversion blue lumines cence, which indicates that mixed lead halide-modified Tm3+/Yb3+ -cod oped tellurite glasses can be used as a kind of potential host materials for upc onversion blue lasers.