A fabric file release system for automatically calibrating a circular knitting machine, comprising a file release end remote to the circular knitting machine and at least one controlled terminal disposed on the circular knitting machine, said file release end comprising a file memorizing unit and a first communication module in information connection with the file memorizing unit, wherein the file memorizing unit is configured to store a plurality of fabric files respectively released by the first communication module, and said at least one controlled terminal comprising a second communication module in information connection with the first communication module for receiving one of the plurality of fabric files and a working management module connected to the second communication module, wherein each of the plurality of fabric files comprises a plurality of knitting machine working marks and a plurality of setting parameter values respectively corresponding to one of the knitting machine working marks; wherein the plurality of knitting machine working marks are respectively selected from the group consisting of a yarn feeding length, an upper cylinder stitch adjustment, a lower cylinder stitch adjustment, a knitting timing adjustment, an operating time, a time required for starting a knitting machine to a working speed, and a time required for stopping the knitting machine, the working management module comprises a setting file of knitting machine working comprising the plurality of knitting machine working marks and a plurality of working parameter values respectively corresponding to one of the knitting machine working marks, and is configured to receive one of the plurality of fabric file from the second communication module, and the plurality of working parameter values of the working management module are configured to control a plurality of members of the circular knitting machine to knit a fabric; characterized in that the working management module is configured to map the plurality of setting parameter values corresponding to each of the knitting machine working marks in one of the plurality of fabric files to the plurality of working parameter values corresponding to each of the knitting machine working marks in the setting file of knitting machine working without any code conversion. said file release end comprising a file memorizing unit and a first communication module in information connection with the file memorizing unit, wherein the file memorizing unit is configured to store a plurality of fabric files respectively released by the first communication module, and said at least one controlled terminal comprising a second communication module in information connection with the first communication module for receiving one of the plurality of fabric files and a working management module connected to the second communication module, wherein each of the plurality of fabric files comprises a plurality of knitting machine working marks and a plurality of setting parameter values respectively corresponding to one of the knitting machine working marks; wherein the plurality of knitting machine working marks are respectively selected from the group consisting of a yarn feeding length, an upper cylinder stitch adjustment, a lower cylinder stitch adjustment, a knitting timing adjustment, an operating time, a time required for starting a knitting machine to a working speed, and a time required for stopping the knitting machine, the working management module comprises a setting file of knitting machine working comprising the plurality of knitting machine working marks and a plurality of working parameter values respectively corresponding to one of the knitting machine working marks, and is configured to receive one of the plurality of fabric file from the second communication module, and the plurality of working parameter values of the working management module are configured to control a plurality of members of the circular knitting machine to knit a fabric; characterized in that the working management module is configured to map the plurality of setting parameter values corresponding to each of the knitting machine working marks in one of the plurality of fabric files to the plurality of working parameter values corresponding to each of the knitting machine working marks in the setting file of knitting machine working without any code conversion.