Abstract Until the middle of the 19th century, Newton's laws of classical mechanics dominated science. However, some phenomena that emerged towards the end of the 19th century could not be fully explained qualitatively by the laws of classical mechanics. These phenomena were considered micro-phenomena in terms of size. It was possible to fully explain these phenomena only as a result of the development of quantum mechanics. Therefore, the laws of motion of micro and macro systems are completely different from each other. The existence of this fact is a factor that makes it difficult to build a general theory. According to scientists, the construction of a general theory can eliminate the contradictions between these directions, and today the best position in this matter belongs to the M-theory. However, there is a big problem in determining how to approach the M-theory. It is obvious that one can be sure of the correctness of this approach only when it is possible to fully explain all the phenomena in the Universe, both qualitatively and quantitatively. What is needed now is a complete explanation of all physical phenomena occurring in 3-dimensional space. Quantum Large Scale Theory highlights the important facts that must be taken into account in order to fully explain all phenomena related to the 3-dimensional space part of M-theory. The presentation of this theory and its correct approach will lead to a more accurate understanding of the Universe. The field served by the theory is to complete the 3-dimensional space part of M-theory by taking into account the effects of high-dimensional spaces and using string theory. Purpose: It consists of completing the part of M-theory related to 3-dimensional space by fully explaining all micro and macro phenomena quantitatively and qualitatively through string theory and taking into account the effects of high-dimensional spaces.