在统一展开理论（ＵＥＴ）的框架内，通过提高推导过程中的精度，得到了更精确的结果，且将其推广应用到激光系统中。具体研究了两个激光模型，得到了它们的光强定态几率分布、光强平均值及其相对涨落，通过比较发现，本文所得到的结果明显的改善了用统一色噪声近似所得到的结果而与精确的数值结果和数值模拟结果符合得更好。 Within the framework of UET, more accurate results are obtained by improving the accuracy of the derivation process, and the results are generalized and applied to the laser system. The two laser models are studied in detail, and their probability distributions of light intensity, the mean value of light intensity and their relative fluctuations are obtained. By comparison, the results obtained in this paper are obviously improved by using the uniform color noise approximation The result is in good agreement with the exact numerical and numerical simulations.