The atomic polarizability reflects the degree of response of the atomic system to the external field. The Rydberg atom has a very large polarizability, which makes the Rydberg atom have great application prospects in the external field manipulation of quantum states and the measurement of microwave field strength. The measurement accuracy of polarizability will lay a theoretical foundation for the precise measurement of the external field. In this paper, the measurement of atomic polarizability in the Rydberg state of cesium 50D is realized by using the electromagnetically induced transparency technique. In the experiment, based on the stepped electromagnetically induced transparency spectrum, the AC-Stark effectof the 50D state of the cesium atom was first measured, and the relationship between the spectral splitting interval of the atomic energy level and the field strength was studied, and the tensor polarizability and scalar polarizability were calculated. experimental measurements. The experimentally measured values are compared with the calculated values, and the two are basically consistent. The measurement of the Rydberg state polarizability provides a guarantee for the regulation of the energy level by the electric field and the precise measurement of the electric field strength of the radio frequency field.