To investigate the self-similar propagation of a turbulent expanding flame, H-2/CO/air mixtures, with vas hydrogen fractions (10, 30, and 50%) and equivalence ratios (0.6-1.0) were ignited in a turbulent combustion bomb under various turbulence intensities. The turbulent flame Reynolds number was used to analyze its dynamic propagation characteristics. The results showed that the growth rate of the flame propagation speed gradually decreased when the flame developed to a certain degree. As the equivalence ratio or hydrogen fraction increased, the dimensionless turbulent flame propagation speed decreased, as did its exponential dependence on the turbulent flame Reynolds number. There was a linear relationship between S-T/S-1 and Re-T, f(0.5), and a decrease in Ma due to increase in the hydrogen fraction and decrease in equivalence ratio had completely opposite effects on the self-similar propagation of the syngas/air turbulent premixed flame.