The results showed that the main factor affection the population scale in villages and township in taichung county before 1975 was natural population growth and that after 1975 was population movement 根据本文研究指出,台中县各乡镇人口发展趋势,在1975年以前人口自然增长仍是影响各乡镇人口规模的主要因素; 1975年以后人口社会变动才逐渐取代人口自然增长,成为影响乡镇人口规模的主要因素。