Abstract: Disclosed is an imitational laser-shooting simulated gun including a handle module, a gear box module and a sliding shell module. The handle module includes a housing, an outer cover and a trigger. The housing is covered by the outer cover and defines an installation groove which is set open. The trigger is rotatably set on the housing and exposed out of the outer cover. The trigger is to generate a triggering signal for shooting. The gear box module includes a motor and a gear set disposed in the installation groove and driven by the motor. The sliding shell module is slideably connected with the outer cover, covering the installation groove and engagingly connected with the gear set. The gear box module drives the sliding shell module to reciprocate on the housing according to the triggering signal to generate a recoil. A related virtual reality system is also provided.