Abstract Zhushahong deposit is located in the northwest of the Dexing porphyry copper deposits, and is close to the Tongchang copper deposit. By following the previous works, this paper was focused on fluid inclusions studies of the Zhushahong deposit, through field sampling, optical observations, homogenize temperature and freezing point temperature test of quartz phenocryst, quartz vein and calcite vein, With the result, we draw the following conclusions：(1)five different types of fluid inclusions which were recognized(liquid+vapor, liquid-rich inclusions; liquid+vapor, vapor-rich inclusions; CO2-bearing inclusions; halite-bearing multiphase inclusions; melt-bearing inclusions); (2)Compare with the Tongchang deposit , fluids temperature was slightly low with high salinity; and (3)Ore-forming fluids’ pressure was 47.27~184.47MPa, inferring a metallogenic depth ranging from 2 to 4 km , The result of Laser Raman spectroscopic analyses show that fluids contain CO2,H2S and CH4 gas which may associate with the migration of element Au. All of those characteristics of inclusions indicate that the Zhushahong deposit may be a sub-volcanic epithermal Cu-Au porphyry deposit. In addition, there are at least two sources of ore-forming fluids in the Zhushahong namely high-temperature magmatic fluids and meteoric water. Along with fluid evolution times, mineralization process can be roughly divided into three metallogenic stages i.e. Silicate-sulfide, quartz-sulfide vein (main metallogenic stage, ore-forming temperature is 200~340℃, and salinity is 2.0~15 wt.% NaCl), and carbonate sulfate-sulfide stages. In addition, homogeneous temperature, salinity, and pressure imply that magmatic hydrothermal fluid has boiling or unmixing processes during the fluid evolution and ore formation.