Abstract: In 2D hydrodynamic simulation, Lagrangian mesh are prone to distort. The ALE (Arbitrary Lagrangian-Eulerian) method which combines the best features of Lagrangian and Eulerian representation was widely used to solve large distortion problems. Based on laser-target coupling, a new second order conservative remapping algorithm for physical variables utilizing mass flux was developed. In this paper, the new algorithm is applied in 1D laser-target code and has satisfactory results in practical model simulations.