为研究三维激光检测技术的数据密度对面域构造深度检测结果可靠性的影响，利用三维激光室内检测系统获取了AC10、AC13和AC16三类沥青混合料试件表面三维数据，计算了16种激光数据密度下的MTD指标，分析了激光数据密度对MTD计算结果的影响规律。结果表明：三维激光检测技术测量沥青路面构造深度MTD指标的可靠性较高；当激光数据密度由0.5mm×0.5mm下降到5mm×5mm时，3类沥青混合料试件的MTD均值最大下降了36.52%，标准差增大到0.543mm。同时，仅改变激光数据密度的单方向间距，对MTD计算结果影响不显著。三类沥青混合料试件的MTD与激光数据密度的下降比例间呈明显对数相关性，相关系数均在0.95以上。并且粒径越大的混合料类型路面受激光数据密度变化的影响更大。

In order to study the effect of 3D laser data scanning density on the measurement results when the 3D laser technology is applied to acquire the asphalt pavement mean texture depth (MTD). Using 3D laser Laboratory Testing System, to capture the surface data of asphalt pavement specimens involved AC10、AC13、AC16, considering 16 combinations types of scanning density to calculate the results of MTD on several laser scanning density, and the influence of 3D laser data scanning density on the result of MTD was analyzed. The results show that:3D laser scanning technology has a good reliability on MTD calculation of asphalt pavement; when the laser data scanning density drop from 0.5mm×0.5mm to 5mm×5mm, the MTD averages among three types asphalt pavement specimens declined the most with a 36.52% drop, and the variation coefficient increases to 0.543mm. In addition, only change the direction interval of laser data scanning density is not significant to the results of MTD calculation. There is a significant logarithmic correlation between the MTD of the three types of asphalt pavement and the drop ratio of the laser data density, and the correlation coefficient is above 0.95. The pavement with larger particle size is more affected by the change of laser data scanning density.