Abstract: With the introduction of constructivism notion into information literacy teachin g practice, the author discusses the teaching object and strategy of information literacy teaching in universities and colleges. In order to construct the signi ficance of information literacy education, this article puts forward a way of di viding information literacy into three levels: elementary level, specialized lev el and explorative level, and sets forward three teaching strategies which could be used accordingly, that is, example-driven on-the-spot teaching, resource -driven discoverable teaching, problem-driven exploring teaching.