Increasing use of composite structures in transport industry puts forward new requirements for its maintenance and repair. However, bonding repair process will produce inevitable debonding flaws, and there will also be debonding damage during use service. In this paper, mechanisms properties of compression failure of patch repaired composite structures were explored, and effects of flaws on the properties were analysed. The results showed that buckling of patch repaired structures first occurred in compression process and then failed. Patch repaired structures broke at the damage hole. Under compression load, debonding flaw of patch repaired composite structures would be expanded, which caused the patch and the parent laminates to be detached earlier, and compression bearing capacity became weaker.
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