The phenomenon of a shock train experiencing rapid forward movement when climbing upstream in a conventional rectangular isolator with incident shocks has recently been investigated. Although several studies have concentrated on the modeling of this phenomenon, few works have focused on methods to alleviate the problems caused by it. Therefore, a distributed fluidic control method is proposed herein, which combines distributed slot injections at the isolator walls and boundary-layer suctions at the corners of the downstream part of the isolator through return pipes. The control effect of the concept is verified by experiments in a Mach 3 test section. First, a rectangular isolator with incident shocks is tested to reproduce the phenomenon of a shock train accelerating suddenly when surmounting a reflection point in the background waves. Then, different fluidic control methods are proposed to demonstrate that the rapid movement of the shock train in a rectangular isolator can be effectively controlled through distributed slot injections, employing a closed flow cycle built by return pipes. According to the experimental results, when the shock train forms and climbs upstream in the isolator, the secondary flows are ejected toward the core flow from the distributed slots at the upstream part of the shock train, which increases the boundary-layer momentum and decreases the pressure gradient of the shock train head. The distributed injections induced compression similar to that induced at a compression surface. The shape of the slip line changes gradually as the backpressure increases. Moreover, the maximum sustainable backpressure is less affected.