The energy loss at various areas of the aluminium pots, the distribution of the magnetic flux density and the velocity of flow within the pots were systematically giveen by the comprehensive testing of the physical fields of the pots. The paper made quantitative analysis and scientific evaluation on the rationality of the technical conditions and the running performance of the pots, which provided scientific foundation for having technical innovation and improving the main technical and economic indexes of the aluminium electrolysis. The general benefits and the technical and economic indexes of the pots were effectively improved by the optimization of the technical conditions and the realization of the best operation.