Showcases are facilities created to provide solid preservation to cultural relics in a long-term, through which the evolution of nature and human society are displayed. It is the best way to protect displayed natural and cultural heritage.The interior of a showcase is a relatively air-tight environment. We create a stable inner environment within the showcase to ensure exhibits do not suffer damage from changes in environmental factors outside the case. Lighting inside a showcase shall comply to the Codes for Design of Lighting in Museums. And attribute to creating artistic atmosphere,highlighting exhibits,and illuminating auxiliaries. The light sources should be concealed and the illumination level and angle of light adjusted, Infrared light, ultraviolet light must be filtered out to prevent heat gain and potential damages to the exhibits. Showcases act as the last barrier between exhibits and the audience.