Traditional decoupling control methods have difficulties in industrial applications as a result of heavily relying on model identification and in controller re-designing as a result of mature system. Besides

it is difficult to extract and inherit expert experience of loops' decoupling controls. Based on equivalent transfer function theory

sequence-decision PID parameter tuning method was developed

which control sequences of experienced operators were effectively extracted from historical data. When facing poor control performance due to loops' coupling

junior staff could operate from inheritance of digitalized PID parameter tuning experience of experienced engineers. Method effectiveness and accuracy were verified in two coupling circuit systems in Matlab and Aspen simulation platforms.