PURPOSE:To reduce the term of works, to save the cost, and to improve the safety, by constructing two oblique underground continuous walls up to the depth to reach a water shield layer, and then excavating the ground between the two underground continuous walls, one basement by one basement in order. CONSTITUTION:Two oblique underground continuous walls 1 and 1 which cross on the ground surface GL are constructed up to the depth to reach a water shield layer 2. In this case, when there is no water shield layer 2 at the desired depth, a water shield layer 2 formed artificially by a medical fluid pouring process. Then, the ground between the two oblique underground continuous walls 1 and 1 is excavated as the amount responding to the first basement, and the first basement floor 3 is processed. Then, the ground under the first basement floor 3 is excavated as the amount responding the second basement to form the second basement floors 4 and the second basement oblique pillars 5. And after that, such a process is repeated to construct the underground trunk up to the water shield layer 2, and a large scale of underground spaces 10 and 10 are formed.
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