  The interaction between the supersonic jet and background can influence the
process of star formation, and this interaction also results in a change of the
jet's velocity, direction and density through shock waves. However, due to the
limitations of current astronomical facilities, the fine shock structure and
the detailed interaction process still remain unclear. Here we investigate the
plasma dynamics under different collision states through laser-driven
experiments. A double-shock structure is shown in the optical diagnosis for
collision case, but the integrated self-emitting X-ray characteristic is
different. For solid plastic hemisphere obstacle, two-layer shock emission is
observed, and for the relatively low-density laser-driven plasma core, only one
shock emission is shown. And the plasma jets are deflected by $50 ^{\circ}$
through the interaction with the high-density background in both cases. For
collisionless cases, filament structures are observed, and the mean width of
filaments is roughly the same as the ion skin depth. High-energy electrons are
observed in all interaction cases. We present the detailed process of the shock
formation and filament instability through 2D/3D hydrodynamic simulations and
particle-in-cell simulations respectively. Our results can also be applied to
explain the shock structure in the Herbig-Haro (HH) 110/270 system, and the
experiments indicate that the impact point may be pushed into the inside part
of the cloud.
