Among all MT Inversion methods used at present,there are two sorts of MT Inversion software which have mature system and have been widely used in engineering:One is the IMAGEM software applying inversion method of "Bostik", and the other is the WINGLINK software applying inversion method of "NLCG". There exist obvious differences between the two sorts of software in such aspects as inversion theory, operation system, smoothing pattern static correction and inversion result. On such a basis,the authors analyzed the inversion interpretation of EH-4 magnetotelluric data obtained in a tunnel of Lanyu Railway. The contrast and analysis of the data processed with the two sorts of software are demonstrated in this paper.