Abstract: In this paper, the load capabilities of undamaged, damaged and double-sided scarf patch repaired foam-core sandwich structures are tested through the four-point-bending test. The test results show that the specimen will not fail at the repaired zone but at the loading position far away from the repaired zone. The maximum load applicable for the repaired structure is lower than that for the undamaged structure. Possible reasons and solutions for these problems are discussed in this paper. The simulation of the structure before and after being repaired by the finite element method(FEM) analysis shows that the analysis results agree well with the test results.