In this talk, we investigate $\tau$-tilting graphs of algebras and their quotient algebras, and obtain a sufficient condition for the connectivity of $\tau$-tilting graphs to be maintained in quotient algebras. It is worth pointing out that $g$-tame algebras satisfy this condition. As a consequence, we newly obtain a large class of algebras whose $\tau$-tilting graphs are connected, including in particular the quotient algebras of skew-gentle algebras and quasi-tilted algebras of tame type. This is a joint work with Changjian Fu and Pin Liu.