The coal catalytic hydrogasification is a highly promising technology for converting coal to natural gas. It consists of coal catalytichydropyrolysis and char catalytic hydrogasification. The char catalytic hydrogasification is the rate-controlling step of the whole process because its rate is much less than that of coal catalytic hydropyrolysis. Therefore, it is critical to establish a reasonable kinetic model of Co-Ca catalyzed char hydrogasification in pressurized fluidized bed for the technology′s future development. The variations of particle densityand pore characteristics with carbon conversion were investigated during Co-Ca catalyzed char hydrogasification in a lab-scale pressurizedfluidized bed. The results show that the char particle density decrease as the carbon conversion, and there is linear correlation between thetotal pores specific surface area and reaction rate. These phenomena confirm that the conversion of char should follow the randompore model during Co-Ca catalyzed char hydrogasification. The effects of reaction temperature, hydrogen pressure, and Co loading onthe carbon conversion were researched. It is found that the reaction is controlled by dynamics in the range of 650-850 ℃ . The reaction rateis dramatically increased when the temperature is over 750 ℃ , and the carbon conversion increase from 16.32% to 95.32% when reactiontemperature is elevated from 650 ℃ to 850 ℃ . The carbon conversion is elevated to 94.11% with increasing the hydrogen partial pressurefrom 0.6 MPa to 2.5 MPa. Raising the Co loading from 1% to 3% resultes in the continous increase in carbon conversion, but it has little change when the Co loading is furtherly increased to 5%. The experiment data was analyzed adopting an extended random pore modelwith the introduction of empirical parameters c and p. The results indicate that the activation energy of coal char catalytic hydrogasificationis 122.7 kJ/ mol, and the reaction order is 1.54. The average deviation between the predicted and experimental reaction rate is 4.81%.