Background　and　objectiveAneurysm　rebleeding　after　rupture　can　result　in　a　catastrophic　outcome　with　high　mortality　and　morbidity.　In　this　study,　we　evaluated　the　correlation　of　IARS　(intracranial　aneurysm　rupture　score)　and　aneurysm　rebleeding.　The　aim　of　this　study　was　to　explore　the　clinical　utility　of　IARS　for　better　clinical　decision-making.MethodThe　patients　with　ruptured　intracranial　aneurysms　between　January　2017　and　September　2018　were　reviewed.　Propensity　scoring　match　was　performed　to　construct　a　cohort.　The　morphological　and　hemodynamic　parameters　were　obtained.　The　difference　between　stable　aneurysms　and　rebleeding　aneurysms　was　compared.　Subsequently,　the　correlation　of　IARS　and　aneurysm　rebleeding　was　studied.ResultsThe　matching　process　constructed　a　cohort,　including　5　rebleeding　aneurysms　and　15　stable　aneurysms.　By　comparing　the　difference　between　stable　aneurysms　and　rebleeding　aneurysms,　the　statistical　significance　was　found　in　diameter　of　neck　(p=0.036),　aspect　ratio　(p=0.004)　and　size　ratio　(p=0.029),　normalized　wall　shear　stress　average　(p=0.026),　low　shear　area　ratio　(p=0.028),　oscillatory　shear　index　(OSI)　(p=0.031),　and　deviated　angle　(p=0.025).　The　IARS　here　had　a　strong　correlation　with　the　aneurysm　rebleeding,　and　the　interval　from　the　first　bleeding　to　the　rebleeding　tended　to　shorten　with　the　increase　of　IARS　(R=0.715,　p=0.027).　IARS　had　a　good　predicting　value　for　the　aneurysm　rebleeding　(area　under　the　curve=0.756,　p＜0.001).ConclusionBased　on　this　preliminary　study,　intracranial　aneurysm　rupture　score　may　correlate　to　the　rebleeding　in　ruptured　aneurysms.　For　ruptured　aneurysms　with　high　IARS　scores,　surgery　should　be　given　priority,　and　medical　treatment　is　not　recommended.