Several small cylindrical rock samples with a diameter of 30 mm and a length of no less than 40 mm were to be radically drilled surrounding a borehole wall in measuring the rock stresses with borehole-wall stress relief method.For the need of cutting cylindrical rock samples,experimental testing of drilling parameters was made on the self-designed testing equipment at laboratory.Under the conditions of different drilling modes controlled by drilling depth per second,drilling pressure on bit,and rotary speed of bit,the required small cylindrical rock samples were drilled from three different kinds of cubic rock samples such as red sand rock,marble rock,and granite rock.The results showed that the required cylindrical rock samples can be preferably obtained by the controlled drilling mode of rotary speed of bit.The rotary speed of thin-wall diamond core-drilling bit,the drilling pressure,and the power supplied by the motor for annularly cutting into the borehole wall were quantitatively given according to the testing results.These drilling parameters are to be significant for developing the rock stresses measuring instrument based the borehole-wall stress relief method.