Plant receptor like kinases perceive diverse signals and stimuli from the environment. BAK1(BRI1-associated kinase 1), one of the thorough studied plant receptor like kinases, which involves in the diverse physiological signals regulation process, such as: growing and development, cell death and plant immunity. In this review, we summarize BAK1, as a co-recepter and signaling regulator of the different pattern recognition receptors, involves in mechanism of regulating signal recognition and transduction. And we hope that this review may supply useful information for the further research on the functions of BAK1 gene family in the plant’s resistance response, and provide some clues in clarifying the plant immune signal transduction pathway.