The stope structure parameters were selected based on the production situation of Songhu mine to tackle the problem of high ore dilution rate. The results of optimizing these parameters through grouping experiment method and stereoscopic ore drawing similarity experiment were 20cm of the sublevel height, 18 cm of route spacing, 4 m (2 m+2 m) and 3.2 m (2 m+1.2 m) of caving distance. After that, field industrial experiments of CM1-CM15 and CM0-CM16 (4.4m of caving distance) and CM17-CM35 (3.6m of caving distance) were carried out. The results showed that the practical application effect of caving distance with 4m is unsatisfied and caving distance with 3.2m could achieve higher ore recovery target. The total ore recovery rate is increased by about 11% compared with the 1.8m and 2.2m of array pitch. It is demonstrated that the combination of optimized structural parameters and field industrial experiments is effective to spread in the iron mine.