Abstract: This paper is based on the investigation of 2281 girl students of Han and some women peasants of Han in the country in Xian City and Kaiyuan County of Liaoning Province. The mean menarcheal age is 13. 50 ±1. 21 years in Xian and 14. 40±1. 40 years in Kaiyuan. The me- narcheal age tends to be earlier than expected. It is more obvious in the country. The method of life table is better than other statistics methods. The status quo method is more accurate in the investigation. The results were compared with the reports at home and abroad. The frequency of occurrence of menarche in different seasons and the factors influencing menarche were analysed.

Key words: Menarche; Growth and development