For the physical network, such as the power physical network, the cyber network is built to optimize the regulation and control to constitute the cyber-physical system, in order to achieve optimal control of large scale distributed systems, which brings along with virus, hacking, denial of service from the threat of cyber network may lead to malicious damage in physical system. A distributed dynamic model for a class of power systems with data attack is built with the assumption of attack detectability. Dynamic state estimators are presented to detect the attacked data and estimate its original value. Finally, a simulation of the 9-bus distributed power system shows the effectiveness of the detection of the data attack by the proposed state estimators.