Abstract: The I0128207 working face of yannan coal mine began to withdraw the hydraulic support on March 13，and the ventilation team detected the high temperature point in the no.1 support caving area on April 19.In the following days，the carbon monoxide concentration and temperature of the working face continued to rise，and the working face was closed on April 23.Based on the analysis of the causes of spontaneous ignition in the working face，two sand rods and a concrete seal are constructed in the transportation channel，and water and nitrogen injection are carried out continuously.A concrete seal shall be constructed at the position of 8 meters from the return air gateway to the return air outlet to further reduce the negative pressure on the working face，and water and nitrogen shall be continuously injected into the working face for realtime monitoring.When the gas composition，concentration，temperature and other indicators in the closed area meet the working face opening conditions，the sealing can be opened.Considering I0128207 working face after unsealing continue to withdraw hydraulic support special situation，formulated the working face after unsealing fire prevention technical measures.

Key words: Safety unsealing, Spontaneous ignition, Fully mechanized mining face, Minedout area