Plan design of residential building is usually based on intuition

so there are often shortcomings in room orientation

natural lighting

ventilation and energy saving

causing some problems in its function.A concept of Predominance Score is suggested for different locations of the building according to the room orientation

natural lighting

ventilation and energy saving.Based on the low-density characteristics of isolated house

the suggested Predominance Score(PS) is assigned to each specific zone based on room orientation

amount of natural lighting sources and number of inner walls etc.Then

the plan design is carried out according to the order of PS.This strategy will help architects to make decision on technical analysis rather than on intuition.A case study shows the validation of the suggested strategy.