Through studying the background of water bursting coefficient method and the following three influen-tial factors,lithology,geological structure and water pressure,analyzed the limitation of the water bursting coefficient method on evaluating mining under safe waterpressure of aquifer in coal seam floor.When the floor water inrush types have not been studied carefully and classified,the formulas of calculating water inrush coefficient have no classifica-tion guidance significance,the water bursting coefficient method can not provide correct safety evaluation of mining a-bove the confined aquifer.%从突水系数法的提出背景以及影响突水系数的岩性、地质构造与水压等方面，分析了突水系数法在评价煤层底板带压开采时，存在的局限性。在未详细研究底板突水类型和未对底板突水类型进行分类的前提下，提出的突水系数计算公式不具有分类指导意义，突水系数并不能准确评价煤层底板突水安全性。
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