Abstract: A feedforward system for maximizing jet fuel yield in 8 Mt/a atmospheric and vacuum distillation unit has been developed based on integration application of on-line analytic instruments and advanced process control system. The application indicates that the system has solved the lag issue brought by routine operation control mode which is in pursuit of target product yield of the unit. The original conventional single loop operation is upgraded to a multivariable system operation with a real time feedforward and the efficient creating capacity of the unit is thus increased.