Abstarct: One of the most important defects in asphalt pavements, which are the most common pavements at present, are microCracks. Spreading this tiny flaw, which is not even visible to the eye at the beginning of its formation, will result in huge financial and non-financial costs. For this reason, many studies are carried out annually to find the appropriate method for better understanding of the formation and spread by researchers. One of the methods that has recently attracted much attention in asphalt behavior is acoustic emission. The acoustic emission method is a non-destructive evaluation method that examines the waves generated by the defect and gives useful information such as the location of formation, the process of expansion, and so on. In this study, two different specimens of standard Marshall and Bent joist were tested under this method and evaluated with the diagrams of the parameters of this method as well as one of its most applicable displays, the process of formation and expansion of microCracks in the specimens. The results show that by applying the parameters of this method, the breakdown stages of each type of asphalt can be divided into three general parts, from microCracks to fractures, as well as the location and process of formation and extension of cracks to fractures in the the new and old asphalts specimen showed with high accuracy using acoustic emission events. baxsed on the results, it can be demonstrated at any time the status of any type of asphalt, demonstrating the same high and reliable acoustic emission efficiency in structural health monitoring of asphalt repairs and maintenance, which has been demonstrated in various previous studies.