In the‘Specifications for Seismic Protection of Museum Objects’(WW/T 00692015), a design method and specific measures for wholesystem seismic protection safety, including the safety of buildings, showcases and collections is proposed based on the seismic protection safety of museum objects. In this article, several key technical issues related to the preservation of museum objects are investigated, including seismic protection methods, applicative scope, and an estimate of the safety of showcases and relics. First, the wholesystem (seismic waves+ buildings+ showcases+ relics) seismic protection design idea is described. Secondly, a safety analysis study of freestanding showcases and relics under earthquake conditions is carried out. Thirdly, the accuracy and reliability of the theory is demonstrated by comparison with research result from the Getty Museum. It is concluded that seismic protection safety of the relics is connected with ratio of width to height, the contact surface friction coefficient and the vertical peak acceleration. The introduction of antislip and antioverturning safety measures guarantees adequate safety of the relics.