A production line system includes n operational stations L1, L2, L3 . . . Ln. Each operational station includes: m operational devices Dn1, Dn2, Dn3 . . . Dnm in each operational station, and the operational devices used for processing operated products with m specifications, respectively, in which n=1, 2, 3, . . . n and m≧1. An initial terminal of the production line system comprises a signal analyzer and a transport mechanism. The signal analyzer is used for analyzing product information of an operated product and for demanding the transport mechanism to deliver the operated product to a corresponding initial operational station and a corresponding operational device according to the product information The production line system provided can deal with products with more than two different specifications at the same time, and especially can apply to producing a small number of products or an experimental batch of products. The production line system has advantages of saving production time of a small number of products, effectively utilizing devices on the production line, improving production efficiency, and reducing production cost.