The methane to flue gas flow ratio significantly affects the progress of thermochemical reforming reaction in oxyfuel combustion glass furnaces. An experimental study was conducted on the methane and flue gas thermochemical reforming reaction under different methane to flue gas flow ratios using atmospheric pressure tube furnace, and the influences of different methane to flue gas flow ratios on thermochemical reforming reaction performance were analyzed. The results indicate that the methane to flue gas flow ratio significantly affects the effective gas yield of thermochemical reforming reaction and the proportion of each accompanying reaction in reforming process. Under the same reaction time and total gas flow rate conditions, the effective gas yield and main reaction proportion of thermochemical reforming reaction within the test temperature range of 1 000 ℃ to 1 400 ℃ are the highest when the methane to flue gas flow ratio is 2∶ 1. The exorbitant methane to flue gas flow ratio can easily lead to a decrease in the proportion of methane dry reforming and methane steam reforming reactions during the methane to flue gas reforming process, while an increase in the proportion of methane cracking reaction. The methane reaction rate increases with the increase of methane to flue gas flow ratio and decreases with the increase of flue gas flow rate.