To study the hot deformation behavior and related dynamic recrystallization models of Mg-6Gd-3Y-1.5Zn-0.6Zr alloy, single-pass hot compression experiments were conducted on the alloy using a Gleeble-3500 thermal simulation testing machine under deformation conditions of 350–500 °C and 0.001–1 s^-1. The dynamic recrystallization behavior was investigated by OM and TEM. Based on the true stress-strain curve, a critical strain model and a kinetics model for dynamic recrystallization were established. The results show that the dynamic recrystallization behavior of Mg-6Gd-3Y-1.5Zn-0.6Zr alloy is influenced by both deformation temperature and strain rate. With the increase in deformation temperature and the decrease in strain rate, the dynamic recrystallization of the alloy becomes more complete. After deformation, the microstructure of the alloy exhibits a typical bimodal structure. The blocky LPSO phase can promote nucleation of recrystallization through the particle stimulation nucleation (PSN) mechanism, while the lamellar LPSO phase undergoes a kink phenomenon. The analysis results of the microstructure after deformation prove that the established dynamic recrystallization model is highly consistent with the experimental results, indicating that this model can effectively predict the dynamic recrystallization behavior of the alloy.