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Icing on blade surface of the straight-bladed vertical axis wind turbine is a common phenomenon in the cold and moist conditions, which affects the performance of wind turbine greatly. Computer simulations based on the 2D incompressible steady flow were carried out in this study to simulate the ice accretion on a static straight blade and the icing effects on the aerodynamic performance of the blade. The ice accretions on the aerofoil at some typical attack angles were calculated, and the changes of blade aerodynamics performance and flow fields around blade under icing condition were also calculated and discussed. The results show that the ice accretion and icing effects on blade aerodynamic performance are quite different at different attack angles.