A yarn supply package replacement method for a creel stand using a yarn supply package supply system including a storage unit storing a plurality of yarn supply packages each formed by winding a yarn made of synthetic fiber on a bobbin, a creel stand including a plurality of support portions unwindably supporting the yarn of the yarn supply packages, a yarn supply package supply device extracting the yarn supply package from the storage unit and attaching the yarn supply package to the support portion of the creel stand, a bobbin mounting member provided to correspond to each of the plurality of support portions, being attachable to and detachable from the bobbin, and holding support portion specifying information capable of specifying the corresponding support portion, and a recognition mechanism (69,79) recognizing the support portion specifying information held by the yarn supply package, the yarn supply package replacement method for the creel stand comprising: a first step of mounting the bobbin mounting member on the yarn supply package not mounted with the bobbin mounting member among the yarn supply packages stored in the storage unit; a second step of extracting the yarn supply package, mounted with the bobbin mounting member in the first step from the storage unit, by the yarn supply package supply device; a third step of recognizing the support portion specifying information, held by the bobbin mounting member mounted on the yarn supply package extracted by the yarn supply package supply device in the second step, by the recognition mechanism (69,79); a fourth step of attaching the yarn supply package to the support portion, specified based on the support portion specifying information recognized by the recognition mechanism (69,79) in the third step, by the yarn supply package supply device; a fifth step of extracting the bobbin of the yarn supply package having run out of yarn among the yarn supply packages attached to the support portions by the yarn supply package supply device in the fourth step from the support portion; a sixth step of removing the bobbin mounting member from the bobbin extracted from the support portion in the fifth step; and a seventh step of using the bobbin mounting member removed in the sixth step as the bobbin mounting member mounted in the first step. a first step of mounting the bobbin mounting member on the yarn supply package not mounted with the bobbin mounting member among the yarn supply packages stored in the storage unit; a second step of extracting the yarn supply package, mounted with the bobbin mounting member in the first step from the storage unit, by the yarn supply package supply device; a third step of recognizing the support portion specifying information, held by the bobbin mounting member mounted on the yarn supply package extracted by the yarn supply package supply device in the second step, by the recognition mechanism (69,79); a fourth step of attaching the yarn supply package to the support portion, specified based on the support portion specifying information recognized by the recognition mechanism (69,79) in the third step, by the yarn supply package supply device; a fifth step of extracting the bobbin of the yarn supply package having run out of yarn among the yarn supply packages attached to the support portions by the yarn supply package supply device in the fourth step from the support portion; a sixth step of removing the bobbin mounting member from the bobbin extracted from the support portion in the fifth step; and a seventh step of using the bobbin mounting member removed in the sixth step as the bobbin mounting member mounted in the first step.