Abstract: In this paper, the sample striped field mouse Apodemus agrarius ning-poensis Swinhoe was taken from Huai-nan district. In stead of using the grinding degree of the molars to determine the age of the mouse, we used the weight and length as the indexes to divide 2023 mice into 5 groups. juvenile, subadults, 1st stage of adult, 2nd stage of adult and senex. The result shows that there are positive correlation between the weight and length of the mouse to its age.By statistical analysis, it shows that the weight and length of various age groups are significantly different (Table 4 & 8 ). Cosidering its short life, we may suggest that the mouse grows continually all its life.Though there are some overlaps in the weight and length distribution of different age groups (Table 6 & 9 ). Thus, using the weight and length to divide age groups is suitable.Using the length to determine the age of pregnant mouse is more suitable than using weight. This is because the length changes lesser than the weight, it is more accurate.To small animals, such as striped field mouse, to divide them into groups of juvenile, subadults, adults and senex are quite enough.It is accurate to determine the age groups of the mouse by the grinding degree of the molars,but it is too elaborative and is difficult to use widely in countryside. Using weight and length to determine the age of mouse are easy and quick, it saves time and labour, and is more accurate in population analysis. Using the weight and length to determine the age of striped field mouse are popularly both in theory and practice.

摘要： 在黑线姬鼠种群数量变动的研究中,年龄鉴定是一项重要的工作。分析种群的年龄组成,有助于了解种群的繁殖、生长、死亡和数量发展的趋势。计算不同年龄组所占的比例,更有助于判断某些自然疫源性疾病的流行动态。因此,探讨黑线姬鼠年龄鉴定的方法,有重要的理论与实践意义。