## 1 Introduction
[29] demonstrated that IMERG has better performance than 3B42V7 in almost every sub-region of mainland China, especially in relatively dry climate regions. [PERSON] et al. [32] investigated the degree of improvement of the IMERG by comparing the uncalibrated version 3 Late Run IMERG and version 7 TMPA-RT products. They concluded that IMERG shows substantial improvement with miss-rain and false-rain bias reduction and hit rate. Similar assessments of the IMERG were conducted in different regions and climatic conditions (e.g., Africa [34], the Central Amazon [35], and Iran [36], among many others). In summary, the earlier studies found that the IMERG is a good successor of TMPA, and is promising for hydrological and meteorological applications. Meanwhile, authors also highlighted that the continuous researching of IMERG for complex topography is needed as more IMERG data become available in the future [37; 38; 39]. The algorithm for IMERG underwent several upgrades since it was released with initial version 3. Recently, IMERG version 5 products were released in November 2017 and contain data from March 2014 to present. According to [PERSON] et al. [40], version 5 supersedes all prior IMERG versions, and users are recommended to shift to the new datasets as soon as practical. On the other hand, the Japanese counterpart of IMERG, the Global Satellite Mapping of Precipitation (GSMaP), operated by the Japan Aerospace Exploration Agency (JAXA), distributes global precipitation maps with different products: the near-real-time GSMaP_NRT, the standard GSMaP_MVK, the gauge-adjusted standard GSMaP_Gauge, and others [41]. All GSMaP products are available at 0.1\({}^{\circ}\)\(\times\) 0.1\({}^{\circ}\) resolution every hour and can be found at [[http://sharaku.eorc.jaxa.jp/GSMaP/](http://sharaku.eorc.jaxa.jp/GSMaP/)]([http://sharaku.eorc.jaxa.jp/GSMaP/](http://sharaku.eorc.jaxa.jp/GSMaP/)). The latest GSMaP algorithm is version 7, which was updated on January 2017, and corresponding products are available after March 2014. Thus, it is necessary to evaluate the latest versions of IMERG and GSMaP products and offer some insight for product developers and users. As the \"Asian Water Tower\" and \"Third Pole\" [6; 42], the TP plays an important role in water supply of Asia's main river basins and global climate change. Knowing the spatial and temporal patterns of precipitation is vital for meteorology research and water management of the TP. With the improvement in measuring light rain and falling snow, the GPM-era precipitation products seem to have vast application prospects in the TP area. Therefore, there is an urgent need to validate the newly available version of GPM-era satellite precipitation products over the TP. In this study, the performances of IMERG version 5 (IMERG V5) and GSMaP version 7 (GSMaP V7) products were evaluated in the TP through extensive statistical and hydrological validation. We expect that the results could provide useful information for algorithm developers of the newest precipitation versions, which are scheduled to be reprocessed to TRMM-era datasets in the near future. The remaining parts of this paper are organized as follows: Sections 2 and 3 describe the study area, the satellite and gauge data, and the evaluation method. The results are presented and discussed in Section 4. Finally, Section 5 summarizes major conclusions of this study.