<FONT face=Verdana>Wireless sensor and actor networks (WSANs) are composed of a large number of sen sors and a small number of (mobile) resource-rich actors. Sensors gather informa tion about the physical phenomenon

while actors take decisions and then perform appropriate actions upon the environment. The paper analyzes the model of energy consumption

and solves the optimal number of hops when the total energy consumpt ion in a path is minimal under the ideal condition. After that

a hop-adaptive ro uting algorithm (HAR) is proposed to realize the balance between the real-time requirement of data collection and the total energy consumption of the network. The extensive simulations show that

HAR algorithm is advantage to HBMECT algorith m with the balance of real-time and energy-consuming

and it adapts to the case of mobile actor.