Abstract: A new method to estimate the moving target parameters for high range resolution stepped frequency radar under temporal-spatial correlated compound Gaussian distributed sea clutter is proposed. Based on the distributions of the texture and speckle components of the compound Gaussian distribution, the maximum likelihood (ML) estimations of the target range and velocity are deduced and the definition of the target error function (TEF) is brought forward. Based on the principle of minimum TEF, the estimation of the target range is searched for and the better ML estimation of the target velocity is solved out. Numerical examples show the feasibility of the proposed method and this method can estimate both of the velocity and the range for stepped frequency radar under temporal-spatial correlated compound Gaussian sea clutter.