In recent years, the productivity in shipbuilding has greatly been increased by means of “block” or subassembly method with aid of advanced welding technique and more fruitful results may well be expected through “three dimensional block” method in lieu of conventional flat block method. However, when composing the massive, three dimedsional block is thought of, various problems must be solved such as the accuracy in dimension & shape of block, the area of assembly yard, crane capacity, and lifting pads etc. The present paper is concerned with the three dimensional block method which has been established and placed successfully in use of cargo ship construction in this yard as the first attempt in the ordinary shipyard except the newly built, special shipyard in Denmark.