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.