Abstract: Aiming at large inclined angle, large thickness and strong spontaneous combustion in 3^# coal seam of Getting Coal Mine, through embedded fiber grating sensors, biber bragg grating sensor system is used to carry on long distances and real-time temperature online monitoring for gob. Temperature distribution curve of gob is drew out to study the spontaneous combustion at fully mechanized caving face with large inclined angle in 3^# coal seam.