Abstract: Analyzing the pore structure and surface morphology of silica gels as carrier by gas adsorption and scanning electron microscope, four kinds of silica gels as carriers used for catalyst were measured. The result shows that all four kinds of silica gels contain a large quantity of cylindrical mesopores which open uniformly at both ends and mesopores with narrow pore size distribution; the specific surface of silica gel LSG-1 is close with silica gel 955, the total pore volume of all four kinds of silica gels is more than 1.550 cm³/g and the average pore size is more than 21.00 nm; the pore size distribution of all are similar and approximate to Gaussian distribution; all silica gel particles have good sphericity, and exhibit uneven and rough surface with crack.