Abstract: Iron tailings and wastes have been generated by a large number of iron ore mines in the semi-arid ecologically fragile areas of western Liaoning Province in China. The resulting environmental pollution and the scarcity of soil sources can also pose a serious threat to the reclamation of abandoned mine sites, such as open pits. In this study, the large-scale agricultural resource utilization of iron tailings was proposed to construct a reclaimed farmland soil profile in the western Liaoning Province, China. Specifically, the iron tailings and wastes were also used to fill the mining pits. The iron tailings and normal farmland soils were collected from the same region. A series of experiments were then carried out on the basic physico-chemical properties, elemental content, and utilization feasibility of iron tailings. According to the theories of “the niche of soil layer” and “the critical layer of the soil”, the function of iron tailings was explored as the soil profile material. The technical mode was constructed for a highly arable farmland soil profile with the structure of “loamy-sandy-clayey” suitable for the semi-arid climate characteristics in the study area. The results showed that: 1) The sand grain content of iron tailings ranged from 28.49 % to 33.23%, while the silt content was 66.11% to 71.64%, and the clay content was less than 1.0%. The pH of iron tailings was represented by the weakly alkaline. At the same time, the conductivity was fully meet the requirements of crop growth. The heavy metal content was much lower than the national standard of Soil environmental quality Risk control standard for soil contamination of agricultural land (GB 15618 -2018). It was also rich in the beneficial trace elements required by crops. Consequently, the iron tailings served as the reconstruction materials of the soil profile. 2) Iron tailings were utilized as the sandy structure with large intergranular pores for water storage. A soil moisture retention layer was constructed to form a soil profile configuration system from the top to the bottom of "loamy (topsoil layer)-sandy (moisture retention layer)-clay (water barrier layer)". As such, the iron tailings were used to store and preserve the water and moisture for crop growth in the semi-arid areas. Meanwhile, the iron tailings were mixed in 25% amounts into the clayey topsoil, in order to increase the thickness of the tillage layer with the better soil texture. 3) The specific construction was to make full use of the waste rock, iron tailings, subsoil red clay, and stripped topsoil produced by iron ore mining. A ‘loamy-sandy-clayey’ soil profile configuration was obtained with the “large rocks with a grain size of 20-50cm (filled up to 1m from the surface) - crushed rocks with a grain size of 4-6cm (20-30cm) - red clay (20-30cm) - iron tailings (20-30cm) - stripped topsoil (20-30cm, mixed with iron tailings of about 25%)”, in the order from the bottom to the top. Four reclamation cases were selected in Jianping County, Liaoning Province, China. Therefore, the area of cultivated land increased to solve the ecological problems caused by solid waste accumulation in mining areas. The quality of farmland was also improved to increase the yield of maize by 705 kg/hm². National food security was maintained to alleviate the contradiction between mining and agricultural land. The ecological restoration mode can be applied to similar iron ore mining areas, according to the regional conditions.