Abstract: The belt transportation system is used in Yongshaba Mine of Kailin Group.The unreasonable blasting parameters result in uneven fragmentation of ore，and more and more bulk rate，thus affecting the mining capacity.In view of this situation，through the theoretical calculation and the field test，the hole-by-hole blast technique with small counteraction line is adopted to determine a reasonable differential time and stem length to obtain the optimal blasting parameters.So，the bulk rate is reduced，and the stability of belt transportation system is ensured.

Key words: Belt transportation system, Medium-depth hole blasting parameters, Bulk rate