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The determination precision of temporary tidal gauge's chart datum is influenced by tidal nature similarity, datum transfer distance and topographical environment characteristics. This paper has studied the relationship between precision and influencing factors, and specific precision functional models in south and north branches of Yangtze River Estuary have been given respectively, through a large number of chart datum transfer tests with using tidal gauges' data in the Yangtze River estuary. The tests results indicate that the chart datum transfer precision in the south branch can be superior to 8 cm, when the difference of tidal type is less than 0. 05 and transfer distance is less than 80 kilometers. While, the precision is 20 cm in the north branch when the distance no less than 40 km. The research achievement has an important significance to the determination precision of chart datum transfer in the Yangtze River estuary. [ABSTRACT FROM AUTHOR]