Abstract: When the transverse tension of fiber-reinforced hydrogel composites exceeds a certain limit, the interaction between fiber and hydrogel causes the longitudinal shrinkage and buckling of the composite materials. In order to analyze the influence of chain-entanglement on the tensile properties and buckling behavior of fiber-reinforced hydrogel composites, the constitutive equation of fiber-reinforced hydrogel composite was established by means of virtual work principle and the critical tension condition was given based on the stability theory of compression bar. Then by using the Slip-Link model to analyse the influences of entanglement conditions on the tensile properties of fiber-reinforced hydrogel composite, and the buckling critical tension and critical elongation were calculated. The results show that the more cross-linking points of the molecular chain, the stronger the inextensibility and the larger the slip parameter of the molecular chain, the more difficult it is to deformation and the larger the critical tensile force required to be applied when the composite buckles.