Since 1960's, nitrogen （N2) "green gas" has been used for grain storage to maintain grain quality,control of insect pests in our country, However, in order to annoy (N2) the oxygen displacement, storehouse of the source, grain heap to annoy airtight, air to examine in the nitrogen and the safety operate protection's etc. a series of key technique a problem up found out to effectively resolve a method, so the green nitrogen (N2) keep a grain technique, the research has been be placed in small scale of on trial investigate stage, it adjusts with carbon dioxide （CO2) to keep a grain technique similar temporarily return hard carry on largescale production expansion application. My database in 2005 started adjusting to keep a grain technique to the green nitrogen （N2) of particularly item research, by my database engineering technical personnel gram bitterness offend a pass,in solving to perplex green nitrogen （N2) to adjust to keep a grain technique expansion an applied series of key technique a hard nut to crack obtained breakthrough progress, carried on green nitrogen (N2) to adjust to keep the grain technique storage to experiment with expansion application study also obtained success, currently our database carry on green nitrogen （N2) to adjust to keep the grain production experiment of grain already 52990. 141 tons,have whole databases to always keep a grain of 78.2%.
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