In this study, hydrodynamics and reaction characteristic of K-based solid sorbents for CO2 capture were investigated using a continuous system composed of two bubbling fluidized-bed reactors(1.2 m tall bed with 0.11 m i.d.). Potassium-based dry sorbents manufactured by the Korea Electric Power Research Institute were used, which were composed of K2CO3 of 35% for CO2 absorption and supporters of 65% for mechanical strength. The continuous system consists of two bubbling fluidized-bed reactors, solid injection nozzle, riser, chiller, analyzer and heater for regeneration reaction. The minimum fluidizing velocity of the continuous system was 0.0088 m/s and the solid circulation rate measured was 10.3 kg/m2-s at 1.05 m/s velocity of the solid injection nozzle. The CO2 concentration of the simulated gas was about 10 vol% in dry basis. Reaction temperature in carbonator and regenerator were maintained about 70 ℃ and 200 ℃, respectively. Differential pressures, which were maintained in carbonator and regenerator, were about 415 mmH2O and 350 mmH2O, respectively. In order to find out reaction characteristics of dry sorbents, several experiments were performed according to various experimental conditions such as H2O content(7.28~19.66%) in feed gas, velocity (0.053~0.103 m/s) of simulated gas, temperature(60~80 ℃) of a carbonator, temperature(150~200 ℃) of a regenerator and solid circulation rate(7.0~10.3 kg/m2-s). The respective data of operating variables were saved and analyzed after maintaining one hour in a stable manner. As a result of continuous operation, CO2 removal tended to increase by increasing H2O content in feed gas, temperature of a regenerator and solid circulation rate and to decrease by increasing temperature of a carbonator and gas velocity in a carbonator.