This paper describes the method for determination of the mechanical properties of GF/PP textile composite from the results of modal tests. The numerical-experimental identification procedure is based on inverse metamodelling approach consisting of design of computer experiments, approximation of response surfaces from the eigenfrequencies obtained by finite element method and minimisation of divergence among numerical and experimental modal results. The functional to be minimized describes the difference between the experimentally measured and numerically calculated frequencies, which are dependent on parameters to be identified. The main advantage of this method is significant reduction of the number of computations as finite element modelling is performed only in the sampled points. Another advantage is non-destructive determination of mechanical properties thus current approach may serve as quality control of GF/PP laminate production. For current research the identification parameters are four elastic constants and density of GF/PP textile composite which have been validated with results obtained in mechanical testing.