Magnetic induction tomography, as a new detection imaging technology, has important application value in clinical diagnosis and continuous monitoring of cerebral hemorrhage and other diseases. MIT system consists of excitation coil and detection coils, among which there is only one excitation coil, while there are dozen or even dozens of detection coils in previous studies. Due to space limitations and interference between coils, it has important significance to study how to minimize the number of coils without losing imaging accuracy. Aiming at this problem, this paper proposes a bidirectional detection imaging way using only five detection coils to detect magnetic field information in each other′s vertical direction. The complex head model simulation experiments and heterogeneous detection experiments on a single heterogeneous body with radius of 15 mm and two heterogeneous bodies with radius of 7 and 15 mm were carried out, respectively, and the results show that the bidirectional detection imaging way can not only counteract the effect of reducing the number of detection coils, but also have high noise resistance performance and imaging accuracy, which lays a technical foundation for the practical application of MIT.