Cerebral　aneurysm　is　an　irreversible　dilatation　causing　intracranial　haemorrhage　with　severe　complications.　It　is　assumed　that　the　biomechanical　factor　plays　a　significant　role　in　the　development　of　cerebral　aneurysm.　However,　reports　on　the　correlations　between　the　formation　of　intraluminal　thrombus　and　the　flow　pattern,　wall　shear　stress　(WSS)　distribution　of　the　cerebral　aneurysm　as　well　as　wall　compliance　are　still　limited.　In　this　research,　patient-specific　numerical　simulation　was　carried　out　for　three　cerebral　aneurysms　based　on　magnetic　resonance　imaging　(MRI)　data-sets.　The　interaction　between　pulsatile　blood　and　aneurysm　wall　was　taken　into　account.　The　biomechanical　behaviour　of　cerebral　aneurysm　and　its　relation　with　the　formation　of　intraluminal　thrombus　was　studied　systematically.　The　results　of　the　numerical　simulation　indicated　that　the　region　of　low　blood　flow　velocity　and　the　region　of　swirling　recirculation　were　nearly　coincident　with　each　other.　Besides,　there　was　a　significant　correlation　between　the　slow　swirling　flow　and　the　location　of　thrombus　deposition.　Excessively　low　WSS　was　also　found　to　have　strong　association　with　the　regions　of　thrombus　formation.　Moreover,　the　relationship　between　cerebral　aneurysm　compliance　and　thrombus　deposition　was　discovered.　The　patient-specific　modelling　study　based　on　fluid-structure　interaction)　may　provide　a　basis　for　future　investigation　on　the　prediction　of　thrombus　formation　in　cerebral　aneurysm.