采用有序化算符技术得到了封闭原子模型激光系统的ＦｏｋｋｅｒＰｌａｎｃｋ方程，通过积分消元方法将其化简为只含场变量的方程，进而求出了激光光场的Ｑ函数．通过对Ｑ函数的分析，发现激光工作能级间的原子偶极矩在稳态值附近的变化行为对激光光场量子统计性质有决定性的影响，并给出了某些条件下这种影响的具体图像．所得结论适用于范围广泛的激光系统，包括无反转激光系统． The FokkerPlanck equation of the closed-atom model laser system is obtained by using the ordered operator technique. The FokkerPlanck equation of the closed atomic model laser system is reduced to an equation containing only field variables by integral elimination method, and the Q function of the laser light field is obtained. Through the analysis of Q function, it is found that the change of the atomic dipole moment in laser working level near the steady-state value has a decisive influence on the quantum statistical properties of the laser light field, and gives the effect under certain conditions Specific image. The conclusions apply to a wide range of laser systems, including non-inverted laser systems.