It is beneficial for disposal and utilization to improve thickening and dehydration properties of sewage sludge.The influence of dosage and fineness of shale on sludge settlement were investigated experimentally.And It was shown that the addition of shale could improve the sludge thickening without volume increment when the shale dosage with fineness of 250～150 μm was less than 5%.The moisture content of thickened and dehydration sludge with 5%shale dosage were 80% and less than 60%, respectively.The addition of shale during the sludge settlement could improve the uniformity of the mixture of sludge and shale, which was favorite for producing building materials, and alleviate the smell of sludge in despite of increase in some extent in volume afterdehydration.The dehydrationsludge modified by shale could be used as raw materials to produce excellent expanded shale.