Figure 1: gradation stone, Graded Macadam is a mixture of various sizes and sizes of aggregate. When its gradation meets the requirements of technical specifications, it is called a graded aggregate. The paved exhibition hall of the memorial hall is paved with stones, which can walk on the floor and give out a rustling sound at the foot, which reminds people to remember history. This picture shows the memorial hall of the victims of the Nanjing massacre of the micro-blog invasion. Photo 2: the gathering square can enter, many activities including the national public memorial ceremony are held here. Photo 3: cobblestone is a by-product of the exploitation of yellow sand because it is named after the goose egg. The cobblestones are located in the Memorial Museum cemetery square, full eyed cobblestones, a few dead trees, no grass, a lifeless feeling of desolation symbolizes death. Figure 4: the graveyard square can not be entered. No matter what kind of stone, visitors should not throw, should follow the basic visit etiquette. The memorial hall receives about 8 million viewers every year, and the vast majority of the audience can maintain solemn and solemn atmosphere in the visit, but there is no denying that a few people have uncivilized behavior. We will further strengthen the management, add personnel to the square in fixed duty, and also appeal to the audience to visit civilization. Before the Holocaust Memorial Hall, children are used to symbolize the death of pebbles. In April 30th, micro-blog netizen, a micro-blog friend who had repeatedly exposed fine Japanese, released a video on micro-blog on a video in which a few children kept playing the cobbles in the Nanjing Massacre Memorial Hall in the pool.