Abstract: Ruzi calcite deposit mainly occurs in the secondary structures on the side of faults, the deposit is strictly controlled by strata and fault structures, and the formation of the deposit is inseparable from and complementary to geological structures. Affected by the tectonic movement of the faults in the periphery of the mine area, the limestone strata locally folds and inter-layer slip, forming a collapse space, which provides the ore-bearing space for the mineralization of calcite ore. At the same time, with the rise of earth temperature, huge heat energy is generated. At the same time, the structure provides a channel for the migration, dissolution, precipitation and recrystallization of the hydrothermal solution, so that the mineralization hydrothermal solution recrystallizes in the interlayer collapse space and forms a calcite ore body. It is a typical low temperature hydrothermal filling deposit. This paper summarizes the deposit characteristics, ore body characteristics and ore quality of Ruzi calcite mine in the east of Fuchuan Dynasty, Hezhou, analyzes the genesis and ore-controlling factors of the deposit, aiming to provide reference for the search of similar calcite deposits in this area.