This paper analyses and compares the property of the Modified Bayesian Directional spectrum analysis Method (MBDM) and the Modified Maximum Likelihood Method (MMLM) that can be used to estimate directional spectrum and reflected coefficient of phase-locked wave field overlapped by multi-directional irregular incident and reflected waves.The numerical test verifies the results under different wave conditions, different measurement systems, and different reflection features.The computation speed and stability of the two methods is also compared.The analysis addresses that the MBDM is better than the MMLM for directional spectrum estimating, while the MMLM is better than the MBDM for reflected coefficient estimation and calculating speed and stability.