Responsible for series of environmental problems like global warming, melting iceberg, rising sea level and so forth, methane and carbon dioxide are two major kinds of green house gases released during human's living and producing activities and natural process. They are also important hydrocarbon raw materials, and the key to exploitation and application of new source of energy. One effective way to reduce emissions of both gases is by synthesizing syngas using methane and carbon dioxide through reforming reaction. A series of nickel-based catalysts with different supports and loadings of nickel as well as rhodium were synthesized by impregnation and evaluated with BET method, SEM, XRD together with TG techniques for the reforming of methane and carbon dioxide. The results show that the optimal loadings of the active component nickel and the promoter rhodium are 10% and 0.1% respectively. With the pressure at 100 kPa, temperature at 600℃, GHSV at 4 500 h~(-1), the molar ratio of carbon dioxide and methane at 1, the conversion rates of carbon dioxide and methane over 0.1%Rh-10%Ni/gamma-Al_2O_3 can reach 96.69% and 88.57% respectively, and the amount of hydrogen obtained is approximately equal to that of carbon monoxide in the syngas.