The present paper deals with preliminary study on the influence of hydrolyzed polyacrylonitrile on phosphate and nitrogen in loessal soils,the results obtained are summarized as follows:1.The phosphorus fixation in soil is decreased and the available phosphorus is increased with the increase of the concentration of hydrolyzed polyacrylonitrile applied phosphate.2.The ammoniacal nitrogen content and the ammoniacal nitrogen released from soil are increased with the increase of the.concentration of hydrolyzed polyacrylonitrile applied.