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The performance of stream reforming for rich hydrogen co-gas by dimethyl-ether (DME）was experimental studied. The multiunit catalyst which was formed with copper-based catalyst (named CNZ—1) and aluminium/zinc based molecular sieve (named HZSM—5) by means of mechanical mixing, was used. The parameters such as flow rate of reactants including water steam and DME, the reaction temperature as well as the catalyst amount influence on the reforming performance were investigated. Results show that under normal pressure, when DME flow rate increases, the yield of hydrogen increases at the beginning and then decreases. At the range from 250℃ to 500℃, the production rate of hydrogen increases with the increasing of temperature, and the maximum conversion rate of DME almost reaches 100%; the volume fraction of carbon monoxide decreases as the reaction temperature rises; although larger amount of catalyst has no influences on hydrogen production rate under the test conditions, it can improve effectively the conversion rate of DME.