Abstract: To replace the traditional shallow hole retention mining method with the segmented drill‐ ing and deep hole ore-extraction open-pit method，in order to achieve efficient mining of steeply inclined thin ore veins，the focus is on optimizing the structural parameters of the mining area，especially the rea‐ sonable determination of the inter-pillar width and the spacing of the ore-loading routes. Based on the engi‐ neering practice of the original shallow hole retention mining method，through indoor rock mechanics ex‐ periments，the rock mechanical parameters were obtained，and the control variable method was used to conduct a systematic study on the inter-pillar width and the spacing of the ore-loading routes. Using the FLAC3D numerical simulation software，a 3D numerical model of the mining area structure parameters was established，and the stress field distribution characteristics，displacement field evolution laws，and plastic zone expansion ranges of the surrounding rock of the mining area under different parameter combinations were analyzed. The numerical simulation results show that the optimized configuration of the inter-pillar width and the spacing of the ore-loading routes can significantly improve the stress state of the surrounding rock of the mining area，effectively control the deformation of the surrounding rock，and reduce the volume of the plastic zone. Based on the stability analysis of the mining area and the safety assessment of the ore�loading routes，the optimal mining area structure parameters of 5 m inter-pillar width and 8 m ore-loading route spacing were finally determined. The research results not only provide technical support for the safety production of the mine，but also provide important engineering references for the mining of steeply inclined thin ore veins under similar geological conditions.

Key words: sharp dip thin vein, deep hole mining method, stope structure parameters