The invention provides an earthquake action determination method and device, relates to the field of building structure
engineering, and is used for accurately acquiring the earthquake action of a thin
waist-shaped connector. The method comprises the following steps: acquiring gravity loads of single-side structures from the ith floor to the nth floor of the thin
waist type building, an earthquake shear coefficient difference value of the ith floor, gravity loads of single-side structures from the (i + 1) th floor to the nth floor, and an earthquake shear coefficient difference value of the (i + 1) th floor; according to the gravity loads of the single-side structures from the ith floor to the nth floor, the earthquake shear coefficient difference value of the ith floor, the gravity loads of the single-side structures from the (i + 1) th floor to the nth floor and the earthquake shear coefficient difference value of the (i + 1) th floor, determining the earthquake action borne by the connector of the ith floor.