[Abstract]: In order to study the seismic damage evolution low of the column-steel beam staggered joints of concrete-filled steel tubular under earthquake action, low-cycle reciprocating loading tests of 8 column-steel beam staggered joints of concrete-filled steel tubular were carried out.Based on the research results of low-cycle reciprocating loading tests, the nonlinear combination relationship between deformation and energy during the cyclic loading of the specimen is studied.Based on the earthquake damage mechanism of column-steel beam staggered joints of concrete-filled steel tubular, a two-parameter seismic damage model suitable for column-steel beam staggered joints of concrete-filled steel tubular is proposed. The data is obtained through low-cycle reciprocating loading tests. Based on the two-parameter seismic damage model, the seismic damage index is calculated to quantitatively describe the damage evolution law of the column-steel beam staggered joints of concrete-filled steel tubular under earthquake action. The effects of axial compression ratio, staggered height and shear compression ratio on seismic damage of column-steel beam staggered joints of concrete-filled steel tubular are analyzed. It was found that the specimens with a small axial compression ratio tended to advance in the damage process. The cumulative damage was greater than that of the specimens with a large axial compression ratio, the damage development and accumulation of the specimens with a large staggered height were greater than that of the specimens with a small staggered height, and the cumulative damage of the specimens with a large shear pressure ratio was greater than that of the specimens with a small shear pressure ratio.