Abstract: Coloring is an important step of 3D reconstruction based on images.It needs photo consistency checking,i.e.if a voxel is projecting to all regions of consistent color in all views of the voxel.The major methods of photo consistency checking use standard deviation,adaptive threshold,histogram,etc.The histogram based method of photo consistency checking is analyzed and a consistency checking algorithm is proposed.One of the important characteristics of the method is that its parameters does not need to be regulated,thus the algorithm can be easily implemented.The experimental results show that the algorithm is practical and effective.