1. Design the staircase style: Choose an appropriate staircase design based on the architectural space dimensions. For instance, for a deep room with a narrow opening, opt for a straight staircase; for a deep room with a wide opening, select a double-bent parallel staircase; and for a shallow room with dimensions close to the opening, go for a triple-flight staircase.

2. Design the stair tread quantity and size: Refer to the usage requirements of the stairs and the nature of the building to determine the tread size and quantity. Typically, residential stair treads range from 250 mm to 280 mm in width and 160 to 180 mm in height; in shared buildings, stair treads are usually 280 mm to 300 mm wide and 150 to 170 mm high.

3. Design the stair width appropriately: The stair width should be determined based on the width of the stairwell, the type of staircase, and the usage requirements of the stairs.

4. Determine the number of steps per landing: The number of steps per landing is primarily determined by the number of steps per floor and the style of the staircase. For instance, in a double-running parallel staircase, it is more suitable for the number of steps per floor to be even.

5. Properly Design the Staircase Length and Height: Calculate the staircase length and height by combining the tread size and the number of steps in each section.

6. Ensure Adequate Platform Depth: The height of a standard staircase landing should not be less than 500 to 600 mm.

7. Properly design the size of the intermediate landing on the ground floor staircase: including the ground elevation below the intermediate landing and the elevation of the landing surface. If there is a passage below the intermediate landing on the ground floor, the vertical distance between the bottom surface of the landing beam and the ground should meet the requirement of the net height of the landing, i.e., not less than 2000 mm.