Abstract: The construction technology of cumulative blasting and the mechanical behavior of sealing materials were analyzed for the gas drainage sealing technology of coal bed deep-hole cumulative blasting.It is shown that blast hole diameter and sealing material properties are the main factors which influence sealing length.After comprehensive analysis of blasting safety,drainage technology and constructional conditions,the reasonable sealing length of cumulative blasting is considered to be in the range of 7.5 to 10.0m.Finally,the feasibility of coal bed deep-hole cumulative blasting sealing technology was tested with the 14121 and 24021 working faces in Jiulishan Coal Mine of Jiaozuo Coal Group as an example.