Abstract: A comparative study of the physical properties of domestic and foreign peat as growing mediums was carried out. The test items include color, structure, bulk weight, total porosity,void ratio,and saturated water content, etc. The results show that the Chinese peat has an appearance of instability with few soil and other impurities. Compared with the import peat, the Chinese peat has a higher bulk density and decomposition degree, and a lower total porosity and water absorption. There is a significant difference between Chinese and Canadian peat. The water absorption and permeability of import peat added the vermiculite and active component is higher than that of import pure peat and domestic peat.