"Barrier" is a technical method, that is, pollution barrier engineering; vertical or horizontal isolation barriers can block the migration and diffusion paths of pollutants in soil and groundwater, so that contaminated soil and water can be effectively isolated from the surrounding environment within a certain service period, avoiding pollutants and Human contact and migration and diffusion with groundwater cause harm, effectively preventing and controlling environmental risks such as pollution spread and health hazards;"Control" is a management system, that is, a long-term risk management and control system for the site; After the construction of the isolation barrier project is completed, long-term risk management and control of the site is required. Through monitoring the soil, groundwater and atmosphere in the contaminated site and monitoring the barrier system, the barrier effect and the service performance of the system are evaluated and maintained. This technology improves and develops the equipment and construction technology of multi-axis small-diameter mixing piles (5 axes, pile diameter 400mm), which improves the construction efficiency by more than 10% compared with the traditional economical cement-soil mixing piles (2 axes, pile diameter 700mm), saves more than 10% of cement consumption, and saves more than 30% of cost. Energy conservation (isolation barrier per linear meter): The energy consumption of equipment in this technology is between 133-186kWh/m, and that of similar products on the market is about 300kWh/m, which is reduced by more than 40% under the same conditions. Reduction of carbon emissions (per m3 away from the barrier): The estimated carbon emissions from the actual consumption of building materials during the construction stage using this technology are 107.4 kg/m2, which reduces carbon emissions by more than 10% compared with traditional isolation barrier construction technology.