Mechanical/electrical facilities play important roles in building construction. Many interfaces exist among various mechanical/electrical facilities as well as among mechanical/electrical facilities and the building components. If these interfaces were not well integrated and solved, it will result in change orders, delay and cost overrun and the construction will then be compromised. This study focuses on the sequences of mechanical/electrical installation during the construction process and the topics are as follows: (1)The construction interfaces of mechanical/electrical construction and building construction. (2)The construction sequences of facilities and conduits. (3)The sequence logic of the components of the mechanical/electrical construction. (4)The sequence logic between mechanical/electrical construction and building construction. By means of investigation and analyses of sequences and interfaces of different phases of construction, problems will be detected early and be resolved efficiently. The goal is to achieve quality construction through effective construction management.