The present invention relates to a chosen time auto-management system product line, each unit of production processes automatically record the chosen time (Tact-Time) takes place in a fair and relates it to the end of the collection, analysis and management to integrate a chosen time auto-management practices to be in the process of production lines. ; select time auto management method of the production line according to the invention is a product on a production line comprising a plurality of process In the first step, select the time information of the first step and stopping the time of the power source to the product and storing in the memory of the product in the preset process of storing and moving the tack time collected from each process to the PC stored in the memory of the product to the N-th time step is completed and, at the chosen time the PC characterized by a constituted by the process of analyzing the information.
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