The paper aims to quantify the phenomenon of intra-region migration, which based on the official statistics from Taiwan's government, and use GM (h,N) model as the mathematics model to analyze the problem of intra-region migration from year 2004 to year 2010. The paper proposes the five influence factors for the intra-region migration. Through GM (h,N) calculation, and verify by regression method. The result shows that the two main factors influence intra-region migration are the price and income ratio, and the disposable income.