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The use of CFRP to reinforce open-hole steel plate is common in the civil engineering. The mechanical properties of the open-hole plates and reinforced plates in tension is fundamental and have not been fully understood. The study was designed to study the effect of the CFRP reinforcement layer on the test specimens of 3mm thick open-hole steel plates and 6mm thick open-hole steel plates. It is found that the reinforced specimens are failed by the steel-adhesive interface and the rupture of CFRP.It is also found that as the number of CFRP layers increases, the limit load capacity of the specimen is increased linearly, and the limit displacement of the specimen decreases linearly.