宋沿唐制设立左藏库,在内藏库出现之前就已经存在,充国库之用。在内藏库分出之后,仍然作为重要的国库之一,发挥着重要作用。左藏库主要是收入不入内藏的那部分财富。太平兴国二年(977),分左藏库为三库;淳化三年(992)分左藏库为左藏、右藏,各领钱、金、银、匹帛;不久罢费右藏, The establishment of the left Tibetan library along the Tang system in the Tang Dynasty existed before the appearance of the Tibetan library and was used by the State Treasury. After the internal library is separated, it still plays an important role as one of the important national treasuries. The left bank of the reservoir is mainly the part of the wealth that does not enter the internal revenue. Taipingxingguo two years (977), points left reservoir for the three libraries; Chunhua three years (992) points left reservoir for the left possession, right possession, the money, gold, silver, ,