This experiment was carried out to evaluate the effect of slope exposure (North and South) and altitude (250m, 350m, and 500m) on the dry matter yield of mountain pasture. The experiment was allocated as a randomized block design with 4 replications and was undertaken over a period of 20 months from February, 1986 to October, 1987. The results obtained are summarized as follows. 1. The rate of growth and total yield were influenced greatly by slope orientation and altitude. 2. At all altitudes dry matter yield of grasses was higher on the northern slope than on the southern slope. 3. Dry matter yields of grasses on both side of slope were high in the following order, beginning with the altitudes least produced; 250m, 350m and 500m.