The effects of hydrogen (H-2) addition to a fuel jet on a non-premixed oxy-methane flame were experimentally investigated in a lab-scale furnace with a slot-type burner. To observe the flame behavior of a non-premixed oxy-methane jet, the flame stabilization and flame luminescence were measured. The flow velocity was varied in the range of u(F) = 7 similar to 50 m/s for methane (CH4) gas and u(Ox) = 10 similar to 120 m/s for oxygen (O-2) gas. The objective of the current study is to investigate the characteristics of the flame stabilization, flame spectra, and flame structure of a non-premixed oxy-methane flame as increasing H-2 mole fraction in the fuel jet. The mole fraction of H-2 gas in the fuel jet (X-H2) was changed from X-H2, = 0-15% over five steps. The experimental measurement showed that the flame stabilization area broadened as the hydrogen mole fraction in a fuel jet increased. In addition, the flame length of the non-premixed oxy-methane flame decreased as the hydrogen mole fraction in the fuel jet increased. (C) 2013 Elsevier Ltd. All rights reserved.