The wind-induced response and Equivalent Static Wind Load (ESWL) for a lattice tower was conducted in this paper by adopting the combined POD-Ritz method , Harmonic Excitation Method (HEM) and Load Response Correlation method (LRC) and. The load-dependent-Ritz vibration modes for the lattice tower were obtained by utilizing the Proper Orthogonal Decomposition (POD) method on the simulated fluctuating wind loading in the proposed POD-Ritz method. By selecting 40 load-dependent-Ritz vibration modes and 100 traditional free vibration modes, the wind-induced responses and equivalent static wind loads for the lattice tower were conducted respectively. The comparison between these two sets of numerical analyzed results showed that the difference in wind-induced response obtained by using two different types of vibration modes is very small. The numerical analysis accuracy in evaluation of wind-induced vibration response for the lattice tower could be obtained with less load-dependent-Ritz vibration modes and high efficiency in reducing run time and less computation memory. Furthermore an integrated analysis system for the wind-induced response and equivalent static wind loading of the lattice tower was proposed in this paper by adopting the SAP2000 API for the MATLAB environment and the previous analysis procedure. This integrated analysis system could be used as a good reference for wind-induced response analysis for other large complex structures.