In the process of open-pit mining,blasting effect is the key to the production benefit of the mine.There are some prominent problems in the external ramp of Beskuduk open-pit coal mine,such as excessive toe rock,high bulk rate,low blasting and loading rate.This paper aims to adjust the optimum hole network parameters by engineering tests based on the existing construction technology and mechanical equipment conditions of Beskuduk mine.Five groups of blasting tests were carried out at +1240~+1228 west outer ramp,+1240~+1228 east outer ramp,+1216~+1204 west outer ramp and +1144~+1132 west outer ramp,respectively.Each group of test plan was repeated three times,and the average value of the three tests was taken as the final analysis basis.The results show that compared with other test plan groups,it is found that test plan #5 has the best blasting effect on the outer ramps,with the toe rock rate of 3.83%,the bulk rate of 4.22%,the blasting rate of 97.76%,the powder factor of 0.54 kg/m3 and the loading rate of 6.0 car /h.In addition,test plan #5 gives full play to the reasonable cooperation of mechanical equipment and personnel,reduces the generation of toe rocks and bulk rate to a large extent,and improves blasting and loading rates.Through the comparison between before and after improvement,it is found that the optimized scheme greatly improves the poor blasting effect of the outer ramp,and reduces the blasting and excavation cost of Beskuduk mine to a certain extent.