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A gridded station‐based precipitation product, the Chinese Rain Gauge‐based Daily Precipitation Analysis (CGDPA), is used to evaluate the quality of different precipitation products. CGDPA is developed by the China Meteorological Administration (CMA) (Shen & Xiong, 2016). It uses the optimal interpolation to obtain a 0.25° continuous precipitation map and daily resolution based on around 2400 national rain gauges (Figure 2.1a). CGDPA also implicitly considers the topographic effect on precipitation. Due to the high density of stations and well‐designed interpolation methods, CGDPA has high accuracy and has been widely used as the reference for satellite/reanalysis precipitation assessment (Tang, Ma, et al., 2016). Noted that the evaluation only involves grids that contain at least one rain gauge to ensure the reliability of results. The period is from 2000 to 2018, which covers the retrospective period of IMERG.