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JP+1]To improve the positioning accuracy and speed of the indoor three dimensional space . From the perspective of decrease the number of node and establish certain coordinate system, this paper puts forward an algorithm for 3D localization based on RSSI attenuation model of 4 Wi-Fi nodes. The algorithm is introduced into four nodes location relatively fixed to improve the decoding speed. Fully considering the effective reflection area affect attenuation index. According to the Brewster's Angle, antenna radiation area can be divided into strengthening area and superposition weakened zone. Construct a three dimensional coordinate system for positioning and combined with the RSSI model, to obtain the indoor three-dimensional coordinates in superposition of weakened zone. This algorithm converses a three-dimensional space problem to two-dimensional space. This paper introduces the principle and verification of the method respectively. The results show that the calculating speed of this algorithm than COLA is improved greatly. The average position error is less than 2 meters.