Abstract: Through modifying the software control system of a single stand four-roll cold rolling mill, the functional capability of the rolling periodic longitudinal profiled strip (PLP strip) was increased. In order to adjust periodic roll gap variation during rolling, special requirements for control systems were made on mechanical equipment parameters and measuring instruments. Micro tracking, monitoring AGC (automatic gauge control), rolling variable tension, rolling variable speed, and other important control functions were developed and improved. Through experiments with updated control systems, PLP strip rolling was implemented satisfactorily, with high precision rolling and accurate cycle length. The new rolling control system meets all requirements for rolling.