The quality of underwater imaging is restricted by laser power and receiver sensitivity. Existing ghost imaging method in free space can get higher resolution than traditional imaging detection. Based on theory of statistical optics and underwater optical properties, a two dimensional reflective underwater ghost imaging method using pseudothermal light source is presented，a theoretical model is built to simulate the dynamic process of pseudothermal field variation and the optical fields modulation by target, and the light intensity fluctuate image of target is rebuilt. Experiment results agree well with the results of numerical simulations indicating that reflective ghost imaging pattern can be applied to underwater imaging.