Aiming at problem of redundancy of data transmitted by cluster head nodes in LEACH protocol in wireless sensor networks（ WSNs）

which results in too much traffic and short entire network life

considering datas of different properties have linear correlation

by introducing the cloud theory and the idea of least squares

a kind of cloud weighted-least squares（ CW-LS） data fusion algorithm is put forward. Simulation results and analysis show that the algorithm can eliminate redundant information

which make the data more accurate

reduce amount of data transmission

and prolong network life effectively.