<p>The dynamics of modern calcite deposition, <i>p</i>CO₂, and stable isotope composition (δ¹³C_CO2) in Liangfeng Cave (Southwest China) were studied monthly over a 2-years period. The study revealed seasonal temperature variation in the cave, which were linked to ventilation. Monitoring sites closer to the cave entrance experienced the most significant temperature fluctuations. Cave air <i>p</i>CO₂ and δ¹³C_CO2 values differed between the dry and wet seasons. During the dry season, cave air exhibited low <i>p</i>CO₂ and higher δ¹³C_CO2, suggesting active gas exchange with the outside atmosphere. These findings have significant implications for understanding seasonal variations in cave air composition and calcite deposition. Our research found that cave air had higher <i>p</i>CO₂ and lower δ¹³C_CO2 in the wet season, with the high <i>p</i>CO₂ gas from the soil layer above the cave during this season. However, cave air <i>p</i>CO₂ was still significantly lower than soil <i>p</i>CO₂, indicating the influx of low <i>p</i>CO₂ from the outside atmosphere. These findings can be used to manage calcite deposition rates, which exhibited marked seasonal variation, with high values in the wet season and lower in the dry season. During the wet season, more rainwater infiltrated, leading to increased limestone dissolution due to higher <i>p</i>CO₂ in the overlying soil, as well as increased CO₂ degassing from drip waters during calcite deposition. In contrast, during the dry season, there was insufficient infiltration of soil CO₂ into the cave, and drip water was undersaturated with respect to calcite. Hence, some sites did not experience calcite deposition during the dry season. In Liangfeng Cave, cave air <i>p</i>CO₂ was slightly higher than outside atmospheric <i>p</i>CO₂, while the carbon isotopes showed different sources in the wet and dry seasons.</p>