NOVELTY - Lower temperature oxygen-containing stream (S1) is mixed with higher temperature oxygen-containing stream(s) (S2) at temperature more than autoignition temperature of fuel. Combined oxygen-containing stream having temperature below autoignition temperature is produced. Combined stream is mixed with stream containing fuel and steam to produce reformer feed. Reformer feed is reformed, and reformate is contacted with cooling stream containing water and/or steam, and superheated steam and cooler reformate are produced. Hydrogen product is recovered from cooler reformate.    USE - Generation of hydrogen used as fuel for fuel cell.    ADVANTAGE - Hydrogen having high purity is efficiently produced at high yield. The pre-combustion temperature in reformer speed is prevented.    DETAILED DESCRIPTION - Lower temperature oxygen-containing stream (S1) of desired amount is mixed with higher temperature oxygen-containing stream(s) (S2) at temperature more than auto ignition temperature of fuel due to indirect heat exchange with flow gas. A combined oxygen-containing stream having temperature below auto ignition temperature is produced. The combined stream is mixed with stream containing fuel and steam to produce reformer feed, such that the molar ratio of oxygen, steam and fuel is set as favorable ratio for reforming. The reformer feed is reformed under partial oxidation/steam reforming condition to produce reformate containing hydrogen. The reformate is subjected to indirect heat exchange condition with a cooling stream containing water and/or steam, and superheated steam and cooler reformate are produced. Portion(s) of superheated steam is used to provide reformed feed, and hydrogen product is recovered from cooler reformate. The fuel contains natural gas, liquefied petroleum gas, alkanol, alkane diol and/or alkane triol, preferably ethanol. An INDEPENDENT CLAIM is included for hydrogen generator (100).    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic flow sheet illustrating manufacture of hydrogen.    Hydrogen generator (100)    Auto thermal reformer (102)    Indirect heat exchanger (106)    Water gas shift reactor (108)    Pressure swing sorption system (116)