In view of the characteristics that urea is easy to absorb moisture and deliquesce when the air humidity is high,we use the urea moisture absorption critical curve and temperature & humidity control line of the raw material warehouse，and consider the problems encountered in the design process of the material storage warehouse of the Moron petrochemical terminal project to compare the three dehumidification schemes,i.e.the summer freezing dehumidification+winter heating scheme,rotary dehumidification scheme and steam dry heating scheme,which can be taken during storage.The result shows that the steam dry heating air scheme can keep the temperature and humidity of the urea in the warehouse in the urea drying zone by treating the fresh air,which can meet the urea storage requirements;the steam heating unit equipment is simple and easy to control,and the investment is low. Since the project site is equipped with a heating boiler room,and the steam supply is sufficient,the project finally adopts the steam dry heating air scheme,which achieved good economic benefits.