Complete and reliable solar irradiance data is the prerequisite of photovoltaic generation research. A new method is proposed to estimate or reconstruct the solar irradiance sequence with constraints of sparse meters and high ratio of outliers. The temporal and spatial relationship of ground irradiance metering from various metering stations in Hexi Corridor in Gansu Province is analyzed by the correlation coefficient method on sunny and cloudy days. In consideration of the prevailing wind

the area correlation model is developed by Voronoi polygon method. By using time phasor delay

the data reconstruction model is built based on the asynchronous sequence. The absent irradiance sequence could be recovered by choosing the metering data with the highest correlation and equivalent time delay in the prevailing wind as inputs. The data test has shown that both the accuracy of the area correlation model and reconstruction model have reach a relatively high level.