摘要： 选用中国1989年全年出生的双生子出生记录，分析城乡差异对中国不同生育年龄妇女生产异性双生子的影响。结果表明，中国城乡异性双生子出生率与母亲生育年龄变化模式相似，城乡差异对异性双生子出生率有明显的影响。虽然市镇异性双生子出生率普遍高于乡村，但是影响的程度与母亲生育年龄有关。
Abstract:The birth records of twins in 1989 in China were used to analyze the effects of difference between urban and rural areas on the birth rate of opposite-sex twin (OSTBR) at different maternal childbearing age.The results show that the urban and rural populations have the similar changing model of OSTBR with maternal childbearing age,the difference between urban and rural areas has an apparent influence on the OSTBR.The OSTBR in urban areas is commonly higher than that in rural areas,but the degree of the influence is related with maternal childbearing age.