This thesis is based on the developing project of "Testing and research on the related technology of the aerodynamic effect in the high speed railway tunnel", which is from the national railway department and also based on the project of "The research on the micro-pressure wave and tunnel hood around the gate of the tunnel in YuHuai railway with the speed of 200km/h",which is from the second surveyed and design institute of China Railways. Research on the lucubration of tunnel aerodynamic effects mechanism and corresponding alleviation measure was carried out.

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There had the appropriate combination of two factors for the highest volatilization amount of NH3 under two patterns . The applying effect of this technique under different soil types , crop kinds , climate and hole stuff awaited more lucubration .

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