Abstract: In the recent two decades,theories of metacognition have been proposed,for example,the theory of metacognition of Flavell,Brown,the triarchic theory of intelligence of Sternberg.It is consistent that all of these heories play emphasis on the subject's planning,monitoring,valuing and regulating toward their own cognitive activity.These theories reflect the recent trends increasing in contempory psychology:laying stress on self regulation,self-monitoring which advanced control processes in mental activity,Next,this article attempted to propose that there is an inner consistency between the theory of metacognition and Piaget's theory such as formal operation,self-regulation,equillibration.Meanwhile,the essence of metacognition can be explained by cybernetic perspective.

Key words: metacognition, metacomponent, formal operation