At present,information hiding algorithm based on modified intra-pred iction mode has been proposed in the H.265/HEVC.The steganographic algorithm embeds secret information by modifying the intra-prediction mode.But there is no steganalysis method for H.265/HEVC from the available literature.This paper proposes a steganalysis method based on the correlation of intra-predicti on mode.The concept of the correlation of intra-prediction mode is defined firstly,then we an alyze the correlation of 35kinds of intra-prediction modes in the 4×4luma block before and after information hidi ng through abundant experimenl data.35correlation data which change a lot after information hiding are chosen to constitute the video features.Lastly,the video features will be sent to support vector machine (SVM) classifier to finish the detection of information hiding.Experimental results demonstrate that the algorithm has good detection ef fect while the feature dimension is low,and the computational complexity is small.