Considering the steady wind speed and long distance of wake effect in the offshore wind farm，a novel optimization scheme for total wind energy capture of offshore wind farm based on the wake effect is proposed.It aims at making total active power output of wind farms larger than that made by the conventional maximum wind energy capture schemes.In the scheme， the relationship between the active power output of wind turbines and the wake effect is revealed.A quantitative control method for wake effect and an optimization model of active power output in the wind farm is established.The focuses of our research are the methods for control strategies based on the existing computational resources.According to the travel path of wake flow，a wind farm is divided into a few groups，which effectively reduces the number of control objects.According to the properties of operating state and active power output of wind turbines，the search space of optimization equation is reduced and the calculating scale is restrained.By data fitting，the number of optimization variables is reduced and the discrete domain optimization problem is transformed into a continuous global optimization problem，which is easy to use the optimization algorithm with a high credibility.Results of simulation show that the proposed strategy can effectively increase the farm total power and improve the efficiency of wind farms without additional investments.