With the rapid development of urbanization, a large amount of construction waste has been generated from the demolition of old buildings, and a large amount of construction muck has been generated during the construction of construction projects, which is in urgent need of disposal and utilization. With the purpose of saving energy, benefiting waste and treating waste by waste, this project plans to utilize the effective ingredients of waste construction clay bricks and construction muck in a resource-based manner to make them harmless and carry out high value-added resource utilization. This project plans to use construction waste clay bricks and muck to develop a new all-solid waste-based cementitious material; then use it to further dispose of construction muck to modify the muck, improve the flowability and hardening properties of muck, and solve problems such as low fluidity, high compactness and high bearing capacity of the backfill soil in construction projects. At the same time, reduce the dry shrinkage value of backfill soil to ensure fillability after backfilling and shorten the hardening time of fluid backfill soil; Based on the above technical research, a technical plan for the backfilling construction process of modified muck is determined to realize the high value-added resource utilization of building waste clay bricks and construction muck and the technical transformation of its results, which can produce huge social benefits, Economic benefits and environmental benefits.