By way of stepwise discriminant analysis

this paper analyses and in- quires into the general method of constructive types of basic farmland re- gionalization

including fundamental ideas and structure of pattern. The model of the discriminent function is YgX)=1nqg+Cog+C1gX1+C2gX2+…+CmgXm in which Cog=-1/2C1gXig;Cig

=(N-G)WigXig

i∈1

g=1

2

.…

G. where Cig—discriminant coefficients; Xi—varibles; qg—a priority probability; N—number of samples; G—number of regionalization; 1—selected variables. According to the discriminant function comprising the selectedfactors

Gansu Province over the Loess Plateau in the east of the Huanghe Riveris divided into three constructive type regions of basic farmland

that is Ⅰ—constructive broad striped level field and level terrace region in the gully Loess Plateau region of east Gansu Province; Ⅱ—constructive level terrace region in the hilly and gully Loess Pla- teau region is of mid-south Gansu Province; Ⅲ—constructive stone mulch culture

irrigated land and alternation of level terrace and slope region in the low-hills and flat plains before the mountains and hilly and gully Loess Plateau is in the north of middle Gansu Province. A constructive types of basic farmland regionalization map is offered in the end.