Abstract: Proper orthogonal decomposition (POD) is an effective technique for data reduction and feature extraction of the random field. This paper introduces the basic theory of the POD and main advantages of its applications to wind engineering of structures, these include that the original pressure field can be accurately reconstructed with a limited number of modes; the prediction of the wind pressure field increases the pressure tap resolution, the POD technique can be used to predict pressure time series in the regions without pressure taps by using the existing pressure time series. Taking the pitched roof as an example, mentioned contents above which include reconstruction and prediction of wind pressure field was investigated by using the wind pressure data which are measured simultaneously in a wind tunnel test. The effectiveness and practicability of POD was illustrated by comparing with original data in the time domain and frequency domain.