The principle and procedure of far-field direct method to measure EIRP of active phased-array antenna are de-scribed simply in this paper. The principle equation of measuring EIRP is derived. The error of EIRP measurement is analyzed. The results show that RMS error of EIRP measurement is less than or equal to ±0.33 dB. The measured result of EIRP for a S-band active phased-array antenna is given. The result agrees basically with the theoretical calculation result.%简述了远场直接法测量有源相控阵天线EIRP的原理方法，推导出EIRP测量的原理方程。对EIRP测量误差进行了分析，结果表明其均方根误差≤±0.452 dB。最后给出了某工程应用的S波段相控阵天线的EIRP测量结果，测量结果同理论预算基本吻合。
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