For RC beams strengthened in shear with well-anchored FRP strips, potential key factors causing shear failure are described which would give rise to three kinds of shear failure modes. A model of artificial neural network(ANN) has been developed to predict the shear modes of failure for them. And the prediction by the ANN model agrees well with the observation from the test reports. The result showed that the proposed model is fit for predicting the shear failure modes of beams shear-strengthened with well-anchored FRP composites.