食盐既是商品，又是人民生活必须品；既是历代封建王朝的重要财赋来源，又是国家依存的经济体现。宋兴之后，为了巩固政权、颇用重典、在盐政立法上尤重官吏私贩，并作为宋代的国策之一。在商品经济十分发达的宋代，丰厚的盐利诱使上至宰相下至文武百官，利用手中之权进行私盐贩卖。“居崇官者、不得在处回图”之禁令，只不过是一纸空文而已。文武百官私盐贩卖严重冲击官盐市场，侵夺了国家盐利，造成宋代的财政和社会危机。 Salt is not only a commodity, but also a necessity of people’s life. It is both an important source of financial wealth for the feudal dynasties and an embodiment of the state’s dependence on economy. Song Xing later, in order to consolidate the regime, quite a code, especially salt officials in the salt legislation, and as one of the national policy of the Song Dynasty. In the Song Dynasty, where the commodity economy was well developed, lucrative salt industry lured prime minister to the civilian and military officials and took advantage of the power of the hands to sell private salt. “Respect officials who may not be at the map” of the ban, it is nothing more than a dead letter. Civil and military officials private salt trafficking serious impact on the official salt market, invaded the country Salt, resulting in the Song Dynasty financial and social crisis.