Cloud Odeum is a pavilion design for “ Shenzhen&HongKong Bi-city biennale of urbanism \ architecture 2015 ”. In this exhibition, we try to consider about the theme of "Reliving the city" (Theme of the exhibition) from the perspective of city re-imagination, then propose the concept of “ Odeum ” (composition of daily fragments), an urban odeum which represent the environmental permeation (behavior, climate, landscape, etc.) following the variation of time.