Layerwise mark is formed of special monitoring points buried in soil layers of different depth by drilling and exposes on the earth's surface; Based on the variation coming along with the compression and expansion of soil layers, the total settlement and resilience amount of the ground can be monitored. With the construction practice of subsidence monitoring marks in Wenzhou, the key working procedure and control measures for ensuring the quality of layerwise mark are discussed with the improvement of the basement device.