A novel image steganalysis algorithm based on random ferns and ensemb le learning is proposed.At first,the random ferns are constructed with high-dimensional steganalysis features,and th e sample subsets are built based on paired sampling stategy,to generate some base classifiers.Then the prior probability of f erns of traning samplings in base classifiers is calculated,which is ensemble to obtain the final results.The experimental r esults show that the proposed algorithm has low complexity,and can effectively r educe the detection error rate.