Conversion of dimethyl ether over high-silica zeolite catalysts of the ZSM-5 type was studied. It was shown that the introduction of metals into the catalyst composition affects the activity and selectivity of the catalysts. It was found that the catalysts modified with Zr and P are most selective for light olefins. The influence of the addition of water to feedstock on the yields of the desired products was demonstrated; the results are similar to the data obtained by the Lurgi company.