Burnt rock is come into being coal bed self-ignite and bring wall rock metamorphose and has special engineering geological characteristics.Based on the stressstrain and permeability-strain curves of burnt rock obtained from the permeability tests under servo-control condition,the change characteristics of the rock permeability with deformation in the total stress-strain process are discussed,the main differences of permeability-strain relationship and the correlation between permeability and stress for burnt rocks with different protolith natures are analyzed.Finally this paper expounds the engineering significance of the permeability characteristic parameter.