本文引进了一个新的记号，研究色多项式的根全为非负整数的图的色性。
In this paper, a new character is used. When all roots of chromatic polynomials of graphs are not minus integers, the author studies the chromaticity of them.
这些代数条件表示为由椭圆与抛物线，椭圆与双曲线确定的广义特征多项式的根的分布。
The algebraic condition can be represented by the distribution of the roots of the generalized characteristic equation of the ellipse and parabola (hyperbola).
可以利用多项式的根在复平面上的分布构造用于迭代的计算式，使能够对生成图形进行预先设计。
The formulas that used in the iterative procedure are build by means of the distribution of the roots of polynomial equation on the plane, and therefore the generating images are designed in advance.
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