As one of the key techniques for displaying tactile feeling in virtual reality, electrotactile stimulation has been well studied in the past decades. However, the lack of quantization metrics (the effective evaluating method of tactile feeling display at different stimulation modes) has hindered its wide applications. In this paper, based on the classical equivalent circuit model of cutaneous nerve, the responses of three mechanoreceptors (Meissner's corpuscle (RA), Merkel's disc (SAI) and Pancinian corpuscle (PC)) were investigated at different electrical stimulation modes. The influences from electrode distance, electrode quantity, and the optimal stimulating mode of different mechanoreceptors were analyzed in detail. The experimental results were presented, in which the stimulation effects of different mechanoreceptors were evaluated through psychophysical experiments of tactile feeling recognition in a trial-and-error way. The optimal stimulation modes of two mechanoreceptors (RA, SAI) with independent stimulations were obtained, which lays both theoretical and experimental foundation for further improving the effectiveness of the tactile feeling display via functional electrical stimulation.