The height difference between the left and right entrance doors will bring a sense of disharmony to the appearance of the house and affect the overall beauty. Different entrance doors will destroy the symmetry of the building and give people a feeling of instability. Entrance doors with different heights will cause inconvenience in use. For example, pay attention to the change of step height when entering or leaving the door, which may easily lead to unnecessary risk of falling. It is suggested to choose a highly consistent entrance door to maintain the uniformity of the appearance of the house and the convenience of use.