Abstract: In order to replace the landfill treatment mode of underground excavated sludge in Wenzhou,the solidified effect of quicklime on the sludge is explored. The solidified effect of quicklime on sludge in Wenzhou is provided with direct reference data for engineering. The solidification research of the sludge in Wenzhou is carried out in the laboratory. The influence of quicklime on various physical properties of the sludge is mainly explored. Besides,the solidification of the sludge is studied at field. The bearing capacity characteristic value of the solidified sludge is detected by cone penetration test of single bridge and plate loading test. The laboratory test shows that the addition of quicklime has an effect on many physical properties of the sludge,and the engineering and mechanical properties of the sludge are improved. When the content of quicklime is 4%,the UCS of the solidified sludge can reach 116 kPa. The cone penetration test in field shows that the solidified effect of quicklime on the sludge is obvious. When the content of quicklime is 1% ~5%,the average value of specific penetration resistance of the solidified sludge is 0.439~0.773 MPa. According to the plate loading test at field,when the content of quicklime is 1% ~5%,the characteristic value of the solidified sludge bearing capacity is between 126~330 kPa. In the project,quicklime can be used to solidify sludge,and the characteristic value of its bearing capacity can be predicted by the linear equation in this study.