Abstract: In order to solve the problems of the monthly Western Pacific Subtropical High (WPSH) indices used in National Climate Center (NCC) monitoring service, a series of the monthly WPSH indices, including the area index, intensity index, ridge line index and western boundary index, are redefined and reconstructed, on the basis of the monthly NCEP/NCAR reanalysis datasets from 1951 to 2010.The reconstructed area index is defined by the "real area" of the WPSH surrounded by the 588 dagpm contour over western Pacific, while the intensity index is the "volume" of the WPSH over 588 dagpm. The reconstructed western boundary index is defined as the minimal longitude degree of the 588 dagpm contour in the region between 90°E and 180°. When 588 dagpm contour disappears in some month, it is substituted by the maximum of this index in this month during 1951 to 2010. The definition of the reconstructed ridge line index has more adjustment. It is defined by the latitude position of the isoline where 500 hPa zonal wind u=0 and ∂u/∂y > 0 surrounded by 588 dagpm contour. When there is no 588 dagpm contour, the 584 dagpm contour is just considered in the definition. If even no 584 dagpm contour exists in some month, it is substituted by the minimum of this index in this month during 1951 to 2010. Both the 500 hPa geopotential height and 500 hPa zonal wind shear line are considered in the reconstructed ridge line index, and no more restricted by 588 dagpm contour, which takes full consideration of the impact of the WPSH system on the summer precipitation in East China.The reconstructed WPSH indices have enabled describing objectively characteristics of the WPSH's monthly change, and overcoming the defect of the excessive dependence of the WPSH indices using in NCC service on the data resolution. The significant correlation of the reconstructed ridge line index and the summer precipitation over the Yangtze River also confirms its rationality and objectivity. Finally, two kinds of relatively independent WPSH indices, the ridge line index and western ridge point index, are selected to combine nine classifications of WPSH, which correspond with all kinds of distributions of summer precipitation anomaly in East China at large. It provides a scientific basis to further understand the relation of the position anomaly of the WPSH and the summer main rainfall belt in East China.