Abstract: This paper deals with the problem of stress analysis of plates with a circular hole reinforced by flange reinforcing member.The so called flange reinforcing member here means that the reinforcing member is built up by setting shapes or bars with any section shape on both sides of the plates along the edge of the hole.Two cases of external loads are considered.In one case the external loads are stressesσ_X^(∞),σ_Y^(∞),and τ_XY^(∞) acting at infinite point of the plate,and in the other the external loads are linear distributed normal stresses.The procedure of solving the problems mentioned above consists of three steps.Firstly,the reinforcing member is taken out from the plates and considered to be a circular bar being solved to determine its deformation under the action of radial force q₀(θ) and tangential force t₀(θ) which are forces acting upon each other between reinforcing member and plate.Secondly,the displacements of plate with a circular hole under the action of q₀(θ) and t₀(θ) and external loads are determined.Finally,forces q₀(θ) and t₀(θ) are obtained by the compatibility of deformations between reinforcing member and plate.Then the internal forces and displacements of reinforcing member and plate are deduced from q₀(θ) and t₀(θ) obtained.