Composite fiber patching techniques have been considered as alternatives to traditional methods of strengthening and fatiguecrack repair in steel structures. It is known that the fatigue strength of a cracked steel element depends on the stress intensity factor SIF at the crack tip which is a function of the stress/strain distribution of the plate. This paper presents an experimental study of tension tests of cracked steel plates repaired by single-side carbon fiber-reinforced polymer CFRP patching in investigating the strain distribution in the vicinity of the cracked region. The test parameters included patch length, patch width, tapered end, and axial stiffness ratio of adherend. It is shown from the test results that the single-side CFRP patching applied onto the cracked steel plate decreased the crack tip strains significantly in the patched face and increased the strains in the unpatched face. Finite-element analyses of the specimens using both the three layers model proposed by previous researchers and a modified three layers model proposed in this study were conducted to examine the strain distributions in the vicinity of the crack. In general, the strain distributions of the specimens were predicted well by the finite-element analyses using either model. The finite-e