Soft Capping is a popular way of protecting wall relics in England and Scotland and wellrecognized in Central and Northern Europe. This technology might meet the need for protection of relics parks in China. According to Scottish research reports, soft capping protection technology should be suitable for natural and cultural environment in the coastal fringe area of China. An experimental study on soft capping to protect ruin wall was carried out in Shanghai for one year. The purpose of the research was to evaluate the effectiveness of soft capping to protect the wall ruins at Guangjiao Temple in Xuan Cheng, Anhui. Two test walls were built using old bricks to simulate the relic walls of Guangjiao Temple. The wall was studied under four conditions:A) the wall head was totally exposed to the environment, B) the wall head was capped with compound planting soil and crassulaceae plants, C) the wall head was capped with sterile soil and Agrostis stolonifera with a waterproof layer beneath and D) the wall head was capped with sterile soil and Zoysiamatrella. The conditions were set respectively to simulate hard capping and soft capping. Four temperature data loggers were installed just beneath the earth capping on the top wall head, with one data logger in the environment to record the change of temperature and humidity in a year. A moisture sensor was used monthly to collect the humidity data of the two walls and a digital camera was used to record changes in appearance of the two walls and the status of plants every month. Over the course of a oneyear experimental study, we found that soft capping can work as a thermal blanket, but mainly under extreme climate conditions. Meanwhile, walls under soft capping are drier than those under hard capping in summer, but almost as wet as those under hard capping in other seasons. We also found that the choice of grass and earth are very important for the performance of soft capping. It is necessary to do the further study.