The soft policy-making is a method that the experts determine the importance or the weight of each factor in a plan

then make comprehensive evaluation and the policy.‘The fundamentals of the method is comprehensive evaluation based on fuzzy maths as B=A*R

here

R is a fuzzy matrix composed by fuzzily evaluated values of each factor in the programmes A is a rank matrix composed by weights that show the important extent of each factor;B is the result from the evaluations *is an operation symbol. When we evaluate several control programmes or plans of soil loss

the first thing is to have rexperts and research workers to estimate the possibility

rationality and feasibility of these programmes

then to choose the adoptable one through comprehensive evaluation. The evaluating of an overall plan can be done by experts and reseach workers in this way that the related land use programme

forest-grass construction programme

husbandry develop programme

capital construction on farmland programme

agricultural production programme

diverified economy programme and other single programmes，included in the olcrall plan

are evaluated and given the weights of them in the plan

the policy-making "yes" or "no" is made to the overall plan. On choosing the best one from several programmes given

at first

the memtership function can be used to transform the values of the farmland area

forest-land area

land area for livestock breeding

the cost to control the soil loss and the income from sideline production into the values between 0

0-1 .0，forming a. fuzzy matrix for evaluation. At last

the nearness of evaluated result of each programme to that of standard programme is calculated through comparing. The greater the nearness

the better the programme.