One reason was that so many soldiers and immigrants had come to Taiwan that it was simply impossible for the government to feed them all. That is why soldiers were given land to raise crops and feed themselves. This was the "military farming system."
一方面也是因為來台的軍隊、移民眷口太多了，由官府應付並不可能，於是軍隊開始有自耕自食的田，也就是「屯墾制」的意思。