Abstract: Based on three-dimensional parametric finite element (FE) models, the parametric investigation was carried out for the orthotropic stiffened composite laminated cylindrical shell with a stepped-lap repair. The influences of the parameters of bonding on the distributions of the peel stress and shear stress of the adhesive were studied, such as load conditions, number of steps, stacking of sequence and mismatch adherend lay-ups. The mean of absolute values and average variance were used to measure the distributions of the peel stress and shear stress of the adhesive. And the optimal parameters of the stepped-lap repair can be determined by this scheme. A three dimensional FE model of this investigation provides further insight into the stresses developed in the stepped-lap repair of the orthotropic stiffened composite laminated cylindrical shell under loading. The results of this parametric investigation may lead to improve design and analysis technique of the stepped-lap repair in the orthotropic stiffened composite laminated cylindrical shell.