Abstract: The application of nondestructive testing of reinforced concrete structures is becoming more and more extensive. This paper introduces the common methods of nondestructive testing of reinforcement, emphatically analyzes the principle of detection work and the simulation and analysis technology of the test model based on electromagnetic induction. It is concluded that the position of steel bar under detection is very clear, its image is clear, and the result is easy to judge. The electromagnetic nondestructive test of reinforced concrete has the characteristics of non-contact, good repeatability, fast speed and good effect.