Abstract ??The three-dimensional numerical method was used to study the dynamic characteristic of the double basket type concrete-filled steel tube tied-arch bridge with long-span and broad width. To simulate the different mechanical properties between steel tubes with concrete, concrete and steel tube elements were established with the same nodes but different sections and materials. The Friendship Avenue Bridge in Shijiazhuang was taken as an example to analyze its dynamic characteristic and seismic response which was a double basket type concrete-filled steel tube tied-arch bridge. The simulation results showed that the whole rigidity of the bridge was large enough, while the vertical and the longitudinal rigidity were bigger than the lateral one. The rotational restraints and the lateral stability of the bridge were enhanced by the lateral braces; the vertical stiffness of the deck was strengthened by the columns. Under the earthquake excitation, different parts of the bridge had different response. With the same strength of excitation, the lateral earthquake excitation had larger effects on dynamic response of the bridge than the longitudinal excitation. Generally, the bridge is safe when the maxim earthquake acceleration was less than 0.10g.