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开中法是明代鼓励商人输运粮食到边塞换取盐引，给予贩盐专利的制度。又称开中。这个一定要加解释。KaiZhongfa，it is a system established in Ming Dynasty in which merchants were encouraged to exchange grain for salt at frontier fortress, so as to get the Yanyin----the salt voucher for salt selling. 还有盐引又称“盐钞”，是宋代的取盐凭证，稍微解释一下，外国人才看的懂。
