In order to solve the problem of high ore dilution rate and loss rate in the non-pillar sublevel caving method mining of Kizil-Tashtek copper-lead-zinc polymetallic mine, the flow characteristic parameters of ore-rock loose in the target ore section were measured by loose flow parameter test. Based on the ore drawing ellipsoid theory, the drift interval and ore drawing step distance were calculated. Through indoor ore drawing simulation test and on-site industrial test, the control variable method was used to study the drift interval and ore drawing step distance respectively. The stope parameters were optimized with the ore recovery difference as the evaluation index, and the optimal drift interval and ore drawing step distance were determined. The results show that when the drift interval and ore drawing step distance are 18 m and 3 m respectively, the ore drawing caving body and the ore drawing ellipsoid body are highly consistent, and the ore dilution rate and loss rate are reduced to about 12% and 15% respectively, which effectively solves the problem of high ore loss rate and dilution rate.