Propose to use projection pursuit（ PP） algorithm to solve the problem of intrusion detection of wireless sensor networks（ WSNs）

use PP algorithm which turns high-dimensional node properties to low-dimension space and node data of multi-properties attributes will accurately aggregation. Through floating of node attribute projection value to detect whether the node is attacked. The experimental results show that this method reduces amount of calculation and reduce energy consumption of detection can be obtained better detection effect than traditional error back propagation（ BP） model detection method.