Background:　Currently,　Cloud　Service　Provider　(CSP)　or　third　party　usually　proposes　principles　and　methods　for　cloud　security　risk　evaluation,　while　cloud　users　have　no　choice　but　to　accept　them.　However,　since　cloud　users　and　cloud　service　providers　have　conflicts　of　interests,　cloud　users　may　not　trust　the　results　of　security　evaluation　performed　by　the　CSP.　Different　cloud　users　may　have　different　security　risk　preferences,　which　makes　it　difficult　for　the　third　party　to　con-sider　all　users＇　needs　during　evaluation.　In　addition,　current　security　evaluation　indexes　for　the　cloud　are　too　impractical　to　test　(e.g.,　indexes　like　interoperability,　transparency,　portability　are　not　easy　to　be　evaluated).　Methods:　To　solve　the　above　problems,　this　paper　proposes　a　practical　cloud　security　risk　evaluation　method　of　decision-making　based　on　conflicting　roles　by　using　the　Analytic　Hierarchy　Process　(AHP)　with　Aggregation　of　Individual　Priorities　(AIP).　Results:　Not　only　can　our　method　bring　forward　a　new　index　system　based　on　risk　source　for　cloud　security　and　corresponding　practical　testing　methods,　but　also　can　obtain　the　evaluation　result　with　the　risk　preferences　of　conflicting　roles,　namely　CSP　and　cloud　users,　which　can　lay　a　foundation　for　improving　mutual　trusts　between　the　CSP　and　cloud　users.　The　experiments　show　that　the　method　can　effectively　assess　the　security　risk　of　cloud　platforms　and　in　the　case　where　the　number　of　clouds　increased　by　100%　and　200%,　the　evaluation　time　using　our　methodology　increased　by　only　12%　and　30%.　Conclusion:　Our　method　can　achieve　consistent　decisions　based　on　conflicting　roles,　high　scalability　and　practicability　for　cloud　security　risk　evaluation.　©　2021　Bentham　Science　Publishers.