Fracture-cavity carbonate reservoir is characterized by strong horizontal and vertical heterogeneity，and the conventional injection-production well pattern has low production and poor economic benefits. At present，scholars have proposed a variety of development modes suitable for this kind of reservoirs，but they have not put forward a set of systematic optimization process for the development modes of fracture-cavity carbonate reservoirs. In order to select the development modes of fracture-cavity carbonate reservoirs more accurately and improve the recovery and actual economic benefits，this article takes a typical fracture-cavity carbonate reservoir（Block A）for example，and comprehensively analyzes the applicability of different development modes in reservoirs with different properties and configurations of by numerical simulation. The results show that the horizontal well can achieve a higher production rate and better economic benefits in dense parts of small-and medium-scale fracture-cavity bodies. Specifically，small-scale“fixed-point development”is a more effective development mode than areal pattern well in reservoirs with low matrix permeability. The water-flooding development of connected fracture-cavity bodies has a higher ultimate recovery than the depletion development. Both water-flooding and gas huff and puff can be effective ways of energy supplement. Finally，the idea of optimizing the development mode of this kind of reservoirs is put forward through analysis of the scale，matrix permeability，and connectivity of the fracture-cavity body.