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Mount Arjuno-Welirang is located on East Java province and stratovolcano with a height that is 3,339 m (10,955 ft) for Arjuno and 3.156 m for Welirang. Mountain (Mt) Arjuno Welirang geothermal system is a volcanic geothermal system. Magnetotelluric (MT) is the most commonly used method of geothermal exploration due to its deep penetration and sensitivity to conductive zone. Magnetotelluric method measures 103 point MT in the geothermal system field on the South of Mt Arjuno Welirang. And also TDEM acquisition measures 103 point to static shift correction. In this research, 1D inversion used Occam Inversion, meanwhile 2D and 3D inversion used Non Linear Conjugate Gradien (NLCG) Algorithm. The processing step of magnetotelluric are consist of time domain convertion to frequency domain, crosspower selection, smoothing data, static shift correction, 1D, 2D, 3D Inversion, and interpretation of inversion model. 3D model inversion consist of 3D with TDEM static shift correction. Based on the results comparisons of magnetotelluric 1D,2D,and 3D data inversion modeling, the conceptual model can delineate the altered rocks, clay cap, reservoir rocks, and fault structures that can support and give recommendation prospect area of Mt. Arjuno Welirang.