The particularity and complexity of college teaching requires college teachers to take appropriate teaching measures to enable students to actively participate in classroom teaching activities and promote students' active learning.Reflection and evaluation of classroom teaching behavior is an important way to promote teachers' professional development.The University of Washington has developed a classroom observation tool,the PORTAAL,for college teachers aimed at promoting students' active learning,which can also be used as a self-rating scale for teaching reflection.This paper mainly introduc...