With an ecological and cultural research into the farm implements of north China since modern times,the authors come to the conclusion that farm implements are the result of farmers adapting themselves to ecological environment,and that there is abundant social information implied in the farm implements and in the customs of using them.

There were many superstitious organizations filled with superstitious belief concepts popular in rural north China during the period of the Republic of China owing to many factors such as social culture and geographical environment and educational level.

This dissertation is a study on marriage and family change in a region of the rural north China.

The literatures cited in papers of Acta Agriculturae Boreali-Sinica in the last 10 years,the joint work situation of authers,the citations type and the languages used in these citations were analysed with the help of citation analysis method.

Formation mechanism of land desertification and adjustment of land use in ecotone between agriculture and animal husbandry in North China;

The food production in the recent 27 years and the relation between potential food production and population carrying capacity were studied by the method of data statistic analysis combined with scientific evaluation in the agro-pastoral ecotone in North China.