Abstract: Project-based learning (PBL) is not a new concept or instruction approach; however, PBL approach has still been the most concern among typicial researchers in the sector of education and especially been implemented widely in many schools and universities all over the world. PBL in the viewpoints of constructivism places partial and explicit responsibility on the students for their own learning. The present study aimed to explore a) the current situation of implementing PBL in teaching English towards constructivist teaching at high schools in Thai Nguyen province, Vietnam; b) the views of high-school teachers on advantages and challenges of PBL in their actual class; c) offer some methods of using PBL in an effective way.