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Bimetallic Cu-In hybrid electrocatalysts are promising noble metal-free catalysts for selective electrochem-ical CO2 reduction reaction (ECO2RR).Most reports show Cu-In catalysts are selective towards CO evolution.However,few show similarly high selectivity towards formate.Herein we fabricated composition tunable Cu-In hydroxides (CuxIny-OH) by the hydrothermal method and studied their composition effect on electro-chemical CO2 reduction in detail.We found that the selectivity of CO2 reduction products shifted from CO to formate when the content of In increased in the CuxIny-OH electrocatalysts.The Cu rich electrocatalyst mostly produced CO,which could achieve a Faradaic efficiency (FE) to 75.8％ at-0.59 V vs.RHE (Cu76In24 based electrocatalysts).In comparison,the In rich electrocatalysts selectively produced formate,which pos-sessed the FE of formate up to 85％ at-1.01 V vs.RHE.Our work systematically illustrates the composition effect on hybrid catalysts,and provides insights into the design of highly selective catalysts for ECO2RR.