In order to achieve the sustainable development of energy and environment, almost every country pops into development of new energy resource. Wind power is one of new energy resource, which has been an advanced subject paid close attention extensively. And off-grid the vertical axis wind turbine system is becoming one of hot issuse of wind turbine system researching. In researching vertical axis wind turbine system, researcher needs a testing system supplying the data of experiment to get a new level. The testing system is desgined for a vertical axis wind brushless dc generator. The system could test the of wind tubine perfomance of the vertical axis wind brushless dc generator, and it could get many wind turbine perfomance curves which is the relationship curve between rotated speed and the mechanical power in different conditons. The designer could choose the best design plans and the cut-in wind speed by these curves.