中文摘要：

从代数曲线的经典理论出发，利用特征数概念，给出了一种基于射影平面上六个点的射影不变量构造方法，并用具体例子加以了验证，且对其应用前景进行了展望．

英文摘要：

In this paper we bridged the gap between algebraic curve and projective invariant. From the classic theory of algebraic curve and definition of Characteristic Number （ CN）, we proposed an approach to construct a projective invariant that is defined by six points on the projective plane. The algorithmic effectiveness was validated by a numeric example. And the proposed invariant would have many applications.