将ＵＲ９０环形非稳腔引入氧碘化学激光器，对其输出模式进行了数值模拟计算，模拟包括了化学动力学、介质横向流动和物理光学等因素；得到与放大率Ｍ和光轴离截取镜距离ａ等参数相关的近场光强、位相及远场光强分布曲线 The UR90 annular unstable chamber was introduced into the oxygen-iodine chemical laser and its output mode was numerically simulated. The simulation included chemical kinetics, lateral flow and physical optics and other factors; obtained with the magnification M and the distance of the optical axis from the mirror a Near-field light intensity, phase and far-field light intensity distribution curve related to the other parameters