Abstract: Basing on the phased array antenna, a hybrid location method which combines the AOA and the RSSI is proposed. For the different antenna unit number N, antenna unit spacing d and the phase difference 琢between the antenna units, the radiation characteristic parameters of the phased array antenna are calculated, analyzed and discussed. Also, the effect of the antenna unit number to the power and the SNR is analyzed. The analysis conclusion is that the beam width Δθ1/ 2 at the whole scanning coverage can be less than 30°when N is 15 and d is 0.45λ, meanwhile the identification distance can be improved to 15 times and SNR to 10log(15) dB. The RFID positioning system with the phased array antenna not only expands the working range but also improves the anti-jamming capability, which is proved by experiments.