Innate immunity considered as the first defense line in insects and vertebrates against microbial invasion. Vast researches in recent years have shown that there are considerable similarities between the molecular organization of animal and plant systems for non-self-recognition and anti-microbial defense. Like animals, plants are able to recognize microbe associated molecular patterns (MAMPs) which are specific to microbes and are not found in plants. Such structures, also called general elicitors of plant defense, are often inevitable for microbial vita and their perception via specific receptors, aware the plant from microbial invasion. The immunity triggered in plant after perception of MAMPs is called MAMP Triggered Immunity (MTI). On the other hand, existence of such surveillance system in plants has resulted in coevolution of microorganisms with plants to develop effectors to disrupt and pass the MTI defense line. In the continuance of this competition, plants have developed other mechanisms to recognize these effectors and created another immunity called effector triggered immunity (ETI). The goal in this paper is to review the last findings about different mechanisms of immunity in plant.