中文摘要：

研究了形如Cθ（u,v）=uv＋θu^av^b（1-u^m）^c（1-v^n）^d的一种新型广义FGM copula中参数θ的精确取值范围．所研究的copula含盖了文献中许多特殊类型的FGM copula,具有广泛的代表性．参数θ的计算方法简单易行,改进并完善了文献中相应的结论．

英文摘要：

The exact solution about parameter θ of a new class of copulas： Cθ（u, v） = uv ＋ θu^av^b（1 -u^m）c（1 -V^n）^d is studied in this paper. This new class of copulas which covers various types of dependence structures in documents have wide representativeness. The computational method of parameter θ is simple and practicable to improve the corresponding conclusions in documents.