Abstract: Based on the pressure measurements of wind tunnel test on a rigid model, this paper first compensates the eigen-modes of fluctuating wind loads with the covariance proper transformation (CPT) technique according to multiple equivalent target responses induced by the fluctuating wind loads. Then, a new computational method was proposed to calculate the equivalent static wind loads (ESWL) of fluctuating wind loads on those linear and complex large-span roofs. At last, the new method was applied to a real engineering project. The results demonstrate that the new method has the merits of explicit physical meaning, simple computational principle and high computational accuracy; it can also effectively avoid the defects in former traditional methods of computing the ESWL and can satisfy the requirements of engineering design.