Abstract: Accurate calculation residual coal gas emission quantity in goaf of fully mechanized caving face is a basic field work for gas prevention and control based on "source management technology". According to sphere direction unsteady diffusion theory, the calculation formulas of gas emission intensity and quantity from residual coal in goaf were obtained. On the basis of production condition of 7354 caving face in Kongzhuang Mine, field measurement and reliability testing on coal particle gas emission were implemented, and the law of gas emission from residual coal in goaf was analyzed. Results showed that it is the most important area of gas emission exchange and prevention in 10 m range of working face bracket rear. The relative gas emission quantity slightly decreased and absolute gas emission quantity gradually increased with the increase of production. Moving frame is the main production process that affects the gas dynamic emission in goaf, so operators must strengthen gas inspection and monitoring during this period.