The Jiaojia Gold Mine employs classified tailings for gravity flow backfill, a method associated with weak applicability in deep mining and severe issues of slurry segregation, stratification, and bleeding. A paste backfill solution was therefore proposed. Rheological characteristic tests and semi‐industrial loop pipeline tests were conducted to systematically evaluate the rheological parameters and pipeline transport resistance of the paste backfill slurry. The results show that the total tailings backfill slurry achieves a paste state at a concentration of 74 %, exhibiting favorable fluidity and stability. Slurries with cement‐to‐tailings ratios ranging from 1∶4 to 1∶15 meet pumpability requirements. During continuous pumping, the pipeline pressure loss is positively correlated with the cement‐to‐tailings ratio,slurry concentration,and pumping flow rate.As the pumping capacity increases, the flow velocity rises, leading to a corresponding increase in pipeline resistance. After stopping the pump with material in the line for 1-2 hours, the risk of pipeline blockage upon restarting the pump is low. The findings not only provide theoretical support and engineering reference for the design of the backfill system and resource utilization of tailings at the Jiaojia Gold Mine but also hold significant importance for promoting green development in the mining industry, reducing tailings discharge, and mitigating environmental pollution.