The current state of preservation of Xiaoshi harbor forts site at Huangshan,Jiangyin city,indicates that rescue restoration and conservation are urgently needed.In order to improve the overall weathering resistance of the rammed earth wall,the “San he tu” formula was optimized based on compressive strength and freezing thaw cycle tests.Results showed that the concentration of glutinous rice plasma should be 1%～2%,that the mass ratio of earth to lime should be higher than 3∶1 and that the potassium alum concentration should not be higher than 0.1%.These results provide a reference when considering the strengthening and conservation of ancient forts sites.