This paper proposes an energy efficient clustering formation algorithm for wireless sensor network, which is called ACE-CILP algorithm according to considering the energy consumption as an optimization parameter. The algorithm can divide a sensor network into a few clusters and select a cluster head base on weight value that leads to more uniform energy dissipation evenly among all sensor nodes. The simulation results show that ACE-CILP algorithm achieves its intention of consuming less energy, equalizing the energy consumption ...