Abstract: Retrograde condensation can seriously pollute formation.The capillary number effect can reduce the impaction.With the development of Tazhong No.I carbonate rock gas condensate reservoirs in China，it becomes more and more important to study the influence of capillary number effect on deliverability of carbonate rock gas condensate reservoirs in order to guide the field development.The definition of the capillary number effect and its influence on relative permeability curve are presented.Through a dual-permeability simulation model，this research gets the capillary number effect on well deliverability for different flow fluid property，formation permeability and pressure drawdown rate conditions.The results show the deliverability is significantly improved if the capillary number effect included.When formation pressure is higher than the dew point pressure，capillary number effect has no effect on well deliverability，however，it has the largest effect just when formation pressure is smaller than the dew point pressure.And then its effect drops.The larger the initial gas-oil ratio is，the higher the pressure drawdown rate is，the smaller the permeability of matrix and fracture s

Key words: carbonate rock, gas condensate reservoir, capillary number effect, deliverability, dual-porosity media