Abstract: It is the key to solve the linking problem among extraction,tunneling and mining in gas outburst mine by accurately forecast and real-time control on the effect of gas extraction. Based on the correlation research and practice,combined with the flow theory of gas extraction in coal seam,the judgment on the extraction standard,the monitoring and control,the mathematical inversion and the determination of gas parameter,we established the dynamic evaluation method for the effect of gas extraction in the extracted work by pre-evaluation,real time evaluation and measurement validation.It provides the technical support for the establishment of the balance among extraction,tunneling and mining,and promotes the overall planning and coordinated development of gas extraction and coal mining.