The present paper deals with preliminary study on the influence of the highly weathered coal on the colloidal properties of soils in Xinjiang.The results obtained are summarized as follows:1.The contents of organic and active humus in the weathered coal were higher than those in brown coal and peat,and the weathered coal was characterized.by a higher content of carboxyl and phenolic hydroxyl groups,a greater buffer capacity and a higher electrophoresis velocity.2.The results showed that organo-mineral complex was formed by the interaction of weathered coal applied and the clay in soil.The intensity of the organumineral complegation increased with increasing amount of weathered coal applied.The characteristics of the organo-mineral complex in the soil applied weathered coal were greater in buffer capacity,CEC and water holding capacity,higher in viscosity and lower in electrophoresis velocity and ultimate pH.From the results mentioned above,it is evident that the application of weathered coal may improve the soil and promote its fertility.