Abstract: For hundreds of years, many great geographers and thinkers have looked upon food as a mirror to reflect the man-nature relation which they were studying. The calculation of the population carrying capacity of the land resource, a reseach field appearing in the early 1980's, still follows the trail of such thought. It is essential to pay attention to lessons left by ancient pioneers when we are going to use methods and models of calculation of other countries in the study of our own country. (1) the potential productivity of the land is a synthetical reflection of the physical characteristics of the land and the management of mankind. So we should fully consider man's reactions to the land and the influence of the development of sciences and technology. (2) All the calculation models and experimental coefficients should be corrected according to the characteristics of the region concerned, the research purpose, and the level of study. (3) The potential capability of the land resource should be differentiatad from the potential productivity of the land, espulation carrying capacity of Binghai and Su-tion carrying capacity of some economic kernel regions. Proceeding from the above principles, the author engages in the calculation of the population carrying capacity of Binhai and Su-zhou, two different types of land use regions, by means of the method of computer-assisted multi-elements analysis.

Key words: land resource, man-nature relation, the population carrying capacity of the land resource, the potential productivity of the land