An argument about granite hilltop potholes in north part of China has continued for a long time, based on detail observation on morphological feature and distribution of granite hilltop potholes, as granite hilltop potholes in other places in north part of China, hilltop potholes in Mount Laoshan also have a characteristics of a smaller mouth, bigger belly and flat bottom. Potholes have a water outlet, apart above the level of water outlet is the part of smaller mouth, the other part below the level of the water outlet is main part of pothole, this part really is bigger belly. According to these characteristics of potholes, it is recognized that pothole was formed and developed by ice erosion on inner wall of pothole by ice in winter. Because no ice above the level of water outlet in pothole , there is no ice erosion, brim of pothole is formed. below the level of water outlet in pothole, there is continuously eroded by ice in winter, the bigger belly is formed. Meanwhile, growth of granite hilltop potholes must satisfy the following conditions: positioning on top of mountain, no sediment and water except rainwater can fall in hilltop potholes. With ice erosion an explanation of characteristics and origin of Laoshan granite hilltop potholes is given. It is recognized that form—growth—destroy of Laoshan granite hilltop potholes is the result of modern ice erosion. It is proceeding now, no relationship with quaternary glaciation.