The influence of exchange capacity of the fibrous sulfonated cation exchanger FIBAN K-1 and the main process parameters of iso-amyl methyl ether production on the yield of the desired product was examined, It was shown that, under the experimental conditions (temperature 60-100 degreesC, the feed weight hour space velocity 2-6 g/(g(cat) h), and CH3OH to iso-C5H10 molar ratio 1 : 2), 2-methyl-1-butene can transform into 2-methyl-2-butene, and 3-methyl-1-butene almost does not isomerize and remains uninvolvcd in the ether synthesis. At a temperature of 80 degreesC and above, the fibrous sulfonated cation exchanger is superior to the beaded resin in activity.