To dispose sludge and construction waste, and make their common resource utilization,construction waste was added to the sludge according to 15% of the mass ratio of the sludge as aggregate, and the in-situ solidification experiment of the sludge was carried out in field.?The test results show that when the content of solidified agent is 8%, the strength of solidified sludge is pretty high, and the laboratory unconfined compressive strength of solidified sludge can reach 320kPa after curing for 28 days. The in-situ solidification experiment in field shows that the characteristic value of soil bearing capacity is 149kPa estimated by cone penetration test when the content of solidified agent is 8%. And the characteristic value of soil bearing capacity measured by plate loading test is 190kPa, which has obvious solidified effect on sludge. With low dose solidified agent, the structure effect of aggregate is not obvious. When the content of solidified agent is 8%, the structure effect of aggregate is beneficial to improve the bearing capacity of solidified sludge and the characteristic value of soil bearing capacity can reach 325kPa. The improvement rate of solidified sludge by structure effect is 71.05%, and the compression modulus of solidified sludge is 55.02%.