As one of the advanced Electromagnetic Non-destructive Evaluation (ENDE) techniques, Pulsed Remote Field Eddy Current technique (PRFEC) has been found advantageous over the other ENDE methods particularly in evaluation of ferromagnetic multi-layered tubular structures. In this paper, PRFEC in conjunction with magnetic field measurement using solid-state magnetic sensors for detection and classification of subsurface corrosion in ferromagnetic multi-layered tubular structures is intensively investigated through simulations and experiments. The characteristics and features of magnetic field signals against different subsurface corrosion are analysed, whilst a noise-suppression method integrating principle component analysis and independent component analysis is proposed in a bid to mitigate the non-stochastic noise in defect-scanning curves. Following this, the feasibility of most likelihood method for classification of subsurface corrosion via PRFEC is investigated.