With the development of ubiquitous power internet of things ( UPIoT) ，the power network and communication network are deeply coupled，and it is of great theoretical value and practical significance to study the reliability and economy of cyber physical power systems ( CPPS) in new growing trend． Firstly，the running characteristics of perception layer and network layer of UPIoT and its influence on the coupling between power network and communication network are systematically described． Secondly，a completely one － to － one model of CPPS interdependent network is established based on the theory of interdependent networks，and the cyber － attack mode and self － recovery ability of communication nodes are introduced． Finally，the reliability of power network and the economy of communication network under the combination of four attack － recovery modes are analyzed and compared by cyber － attack simulation in CPPS． Therefore，some reasonable suggestions on the preliminary development of UPIoT are put forward．