Abstract: Plastering mortar is a kind of mortar that mainly used on the surface of buildings or building elements, thereby protecting walls, improving moisture resistance, corrosion resistance and weathering resistance, and increasing its durability. Meanwhile, a flat, clean and beautiful building surface can be achieved after applying the plastering mortar. The stockpiling of large tailings in Yangjiawan tailings pond of WISCO Resources Group Chengchao Mining Co. LTD has difficulties for utilization due to its low-silica contents. In this paper, the effects of water-binder ratio, binder sand ratio, dispersible emulsion powder dosage, cellulose ether dosage and other factors on the performance of plastering mortar were investigated. A high admixture of 71.4% iron tailings (binder-sand ratio 1/2.5) was used to prepare the plastering mortar. The tailing-made plastering mortar with good compatibility, suitable consistency and setting time, and compressive strength of M5 grade was prepared, providing an effective way for the resource utilization of the large amount of low-silicon iron tailings in this tailing pond.