When wireless sensor network used in complex indoor environment

great propagation loss will be caused and difficult to optimize routing adaptively when environment changed.Based on these problems

we presented a protocol- Weight coefficient Adaptive based Indoor Energy load-balanced Routing (WAIER).WAIER formulate the routing setup process as the typical multiple attribute decision making process

use objective with subjective weight coefficient method and entropy weight coefficient method to adjust the weight coefficient.Nodes can choose an optimal node to relay the data by comprehensive consideration of the weight coefficient

the propagation loss and the energy of its neighbor nodes.Simulation results show that the WAIER make weight coefficient adaptive dynamically

lead to an appropriate allocation of the data.When used in indoor environment

sensor network could obtain a much more even energy distribution

accordingly the lifetime of the sensor network will be prolonged.