Abstract: To discuss that metamorphic carbonate rocks release the amount and ability of CO₂ and CO₂ releasing conditions,CO₂ flux, which metamorphic carbonate rocks release in contact metamorphism, is analyzed and calculated quantitatively on the basis of metamorphic reaction and time integrated fluid flux. The results suggest that the value of CO₂ flux is 0.729×10⁴~2.446×10⁴ mol/cm²,CO₂ is provided mainly by contact metamorphic reations. The generation and release of CO₂ are positive correlation with the degree of metamorphism, and X_CO2 in fluids continuously increases form the zone of dolomite to the zone of calcite, but in the zone of essonite, fluid flux is the largest and X_CO2 sharply decreases for the influence of magmatic water.