In recent years，the base isolation technique has been widely accepted and promoted as one of the most effective approaches for earthquake resistance due to its security and reliability for use with near—field earthquakes．Some researchers have studied and discussed the influence of various Darameters including peak ground acceleration／peak ground velocity(PGV／PGA)， input energy。peak values，and duration of the near—field earthquakes on the earthquake—resistant performance of constructions．Multi—pulse near—field earthquakes have a larger influence on the base isolation structure than do single—pulse near—field earthquakes；thus，more attention has been paid to the security problems of constructions under this working condition．The focus of this paper，therefore．is an isolation project in the northwest district in which the elastic—plastic response time history of near—field earthquakes was analyzed，and a viscous damper was added to improve the current earthquake—resistant performance of the base isolation structure．In this paper，a multi—pulse seismic wave in a near—field earthquake was simulated and synthesized using a MATLAB procedure and a combination of velocity impulse and broadband cornDonents．The design scheme for the X—type symmetrical distributed viscous damper was selected to reduce the additional internal force effect of the energy—dissipating brace on the beam and column construction of the structure．On this basis，a computational model and equation of motion for the composite isolated structure was established．The earthquake response of the base and composite isolated structures was measured under three working conditions including the El Centro wave，the near—field wave of the Chi—chi earthquake recorded at Tcu075 observation station，and an artificially fitted multi—pulse wave．Theoretical analysis and numerical simulation revealed the peak valueacceleration of the base isolation structure was larger than that of the composite isolated structure．The input energy of the structure increased progressively．In particular，the input energy of the seismic wave in the multi-‘pulse near—-field earthquake was greater than that of the Chi——chi wave and significantly greater than that of the E1 Centro wave．When an earthquake occurred。components with many structures entered the plastic stage owing to the input energy factor，which resulted in substantial weakness．However-the time—history curve for energy consumption of the damper revealed that the damper fully exerted its energy consumption under each working condition．The composite isolated structure was able to fully consider the energy consumption of the structure under the action of the near，?field earthquake and multi—pulse near—field earthquake to guarantee the security of the structure．Designers and engineering technicians have focused on displacement of the isolation layer and the bottom column axial force．After discussion and analysis，it has been determined that the complex isolation design is more feasible under the action of the near—field earthquake．This study examined the earthquake responses of structures under different working conditions including the function of multi—pulse near—field seismic oscillation on base isolation structures and the damping effect of composite isolated structures after addition of the damper．The results are summarized in the followicg points：1．The energy consumption of the complex isolation of a composite isolated structure has distinct advantages that can effectively reduce the number of components in the plastic structural system and improve the earthquake resistance ability of the structure in the near—field multi—pulse earthquake process；2．Under the action of a near—field earthquake，the displacement of the base isolation structure in the isolation layer becomes excessively large；and 3．The composite isolated structure can effectively reduce the axial force of the bottom column．