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运用概率型算子的概率性质，研究了局部有界函数f的Integral型Lupas-Bézier算子收敛阶，得到更精确的估计。其研究对于Bézier型算子逼近的研究工作，以及提高运用Bézier法的计算机辅助设计几何造型的精度的估计有重要意义。“,”In this paper, using the probabilistic property of the probabilistic operator, this paper studies the accurate estimation of the convergence rate of the Integral-type Lupas-Bézier operator for the locally bounded variation function. This study is im-portant for the research of the Bézier operator approximation and improving the accurate estimation of CAD geometric model through using the Bézier way.