A joint assembly for a bracket pool. The joint assembly includes at least one receiving channel for receiving a supporting tube of the bracket pool. The joint assembly also includes an installation portion defining at least one coupling region. A detachable storage tray including a containing portion for storing objects and at least one connector is removably coupled to the at least one coupling region of the installation portion for removably connecting the detachable storage tray the installation portion. The detachable storage tray is very convenient to install and disassemble, very stable in use, does not occupy extra space, and has low economic costs and manufacturing time and costs.