According to Datong "dual hard" full-mechanized caving mining conditions,the practice of fire prevention and extinguishment technology by optimizing the ventilation systems,balancing gas pressure,spraying frog in working face,injecting nitrogen into coal seam,and grouting into gob in full-mechanized caving mining face was discussed.

Emphases to describe The distribute database design that the system adopts、The fire wall technique applies、Attestation and authorization technique,The hospital draws up manage measure for the system application.

This paper introduces extending and applying fully-mechanized caving winning craft in ultra-com-bustible thick seam of Yima coal mine, applicated technique groups of fire-proof is formed from driving road-way, support installed,entry mining and safety removing,main content and result is introduced mainly.

This paper analyzes on the reasons of the self-ignition in the fourth and the ninth coal beds in Ningwu Coalfield,expounds the main advantages of the technology of fire prevention and extinction by nitrogen injection,and discusses the effects of the technology of fire prevention and extinction by nitrogen injection.