Weproposeanovelautomaticsalientobjectsegmentationalgorithmwhichintegrates both bottom-up salient stimuli and object-level shape prior, i.e., a salient object has a well-defined closed boundary. Our approach is formalized as an iterative energy mini- mization framework, leading to binary segmentation of the salient object. Such energy minimizationisinitializedwithasaliencymapwhichiscomputedthroughcontextanaly- sisbasedonmulti-scalesuperpixels. Object-levelshapeprioristhenextractedcombining saliency with object boundary information. Both saliency map and shape prior update after each iteration. Experimental results on two public benchmark datasets show that our proposed approach outperforms state-of-the-art methods.