In　the　traditional　cloud　computing　system,　existing　ranked　image　search　mechanisms　will　leak　the　similarity　of　search　results,　even　cannot　prevent　malicious　cloud　servers　from　tampering　with　or　forging　results.　Therefore,　with　the　help　of　blockchain　technology,　we　propose　an　encrypted　image　storage　and　search　system.　A　threshold　encryption　method　based　on　the　matrix　similarity　transformation　theory　is　designed　to　protect　the　similarity　of　search　results.　Besides,　a　hybrid　storage　structure　based　on　blockchain　and　cloud　server　is　designed　to　ensure　the　correctness　and　completeness　of　search　results.　Finally,　we　implement　the　prototype　in　Python　and　Solidity,　and　conduct　performance　evaluations　on　local　Ethereum　client.　The　theoretical　analysis　and　performance　evaluations　using　the　real-world　dataset　demonstrate　that　our　proposed　system　is　secure　and　feasible.