给出了螺旋型手性分子薄膜表面反射方向的圆二向色性的谐波强度表示式 ,分析了谐波的强度与手性分子的取向、分子的螺距和半径等结构参数的关系 ,给出了数值模拟结果。发现在入射光强一定的情况下 ,谐波强度在螺距和半径的取值范围内分别存在着最大值 ,以及螺距与半径之间满足的关系式随分子取向角的变化而不同 The harmonic intensity expression of the circular dichroism of the surface of the helical chiral molecular film is given. The relationship between the harmonic intensity and the structural parameters such as the orientation of the chiral molecule and the pitch and radius of the molecule is given. The numerical simulation results. It is found that in the case of a constant incident light intensity, the maximum harmonic strength exists in the range of pitch and radius respectively, and the relation between the pitch and the radius satisfies with the change of the molecular orientation angle