PURPOSE: To shorten the period of construction by a method in which straight blocks are sideways connected in an angular form with a given length of sloped side, the connected blocks are set vertically at a given interval, and the bottom portions of the angular form of the blocks are connected.

CONSTITUTION: Straight blocks 1W4 are connected sideways in an angular form with 3W5m sloped sides. The connected blocks are vertically set at an interval of 1.5W2.5m and the bottom portions 6 of the connected blocks are connected with blocks 5. Anchors are driven into holes 7 formed in necessary positions of the blocks 1W4 to prevent the deformation or bias of the block assembly. Slope can thus be reinforced at low cost to form strong slope protected from deformation.