It is a practical difficulty that there is not a standard for selecting the structure parameters of sub-dams when designing a dry tailing dam .In view of this issue , the response laws of stability by the structure parameters of dry tailings dams were studied by numerical experiment and example verification .The results showed that the safety factors( FS ) of the dry tailing dam will increase firstly then decrease as the height of sub-dams decrease by degrees . The peak point is the best value point .What’s more, the optimum height of sub-dam has a positive correlation with the total height of dry tailing dam , of which the best value is usually designed at 1/5 to 1/7.Furthermore , there is a positive correlation between FS and the width of sub-dams.The recommended value of sub-dam width ranges 3 metres to 6 metres.%针对干堆尾矿库设计时缺乏子坝结构参数取值依据的实际困难，采用数值试验和工程实证相结合的方法，系统研究了干堆尾矿库坝体结构参数对稳定性的响应规律，提出干堆尾矿库子坝结构参数选取方法。结果表明：堆坝安全系数Fs随子坝高h降低整体呈先增后减的变化规律，峰值为最佳子坝高，其值与堆积坝总高呈正相关，通常取值为堆积坝总高的1/5-1/7；安全系数Fs与马道宽d呈正相关，推荐在3-6m范围取值。
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