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In this paper, the wind load on an arc-shaped canopy roof was studied with numerical wind tunnel method(NWTM). Three-dimensional models were set up for the canopy roof with opened or closed skylights. The air flow around the roof under wind action from three directions was analysed respectively. Wind pressure coeffi-cients on the canopy roof were determined by NWTM. The results of NWTM agreed well with those of wind tunnel test for the roof with opened skylights, which verified the applicability and rationality of NWTM. The effect of the closure of skylights was then investigated with NWTM. It was concluded that the closure of the skylights may in-crease the wind suction on the top surface of the roof greatly and should be considered in the structure design of the canopy roof.