Abstract: Passive energy-saving method helps buildings exchange energy with the surrounding environment without mechanical power based on their climate characteristics． These methods can reduce the energy consumption of buildings and improve architectural ecology． Taking“Hengqin New Home”as an example，the simulation results of buildings' physical environment simulation calculation software were compared with the actual measured results of various physical indicators． It aims to study the application of passive energy-saving technology in high-rise resi- dential buildings，and its impact on the ecology of high-rise residential buildings in south of five ridge of China (also referred“Lingnan area”)． The study shows that high-rise residential buildings in Lingnan area should take measures to reduce solar radiation and strengthen indoor natural ventilation in order to improve indoor environmental comfort． In order to maintain comfortable indoor ventilation effect，the main orientation of buildings should be as far as possible to face the dominant wind direction，and ensure smooth and uniform indoor ventilation channels． Besides，the open area of natural ventilation should meet the requirements and the device should be adjusted con- veniently so that residents can open it flexibly． There is a large cooling demand and new air demand for high-rise residential buildings in Lingnan area throughout the year，so，it is necessary to make rational use of the building shading components to reduce the solar radiation heat gain，and to introduce outdoor fresh air into the indoor cool- ing and supplement the indoor the indoor fresh air in the suitable state，so as to realize the energy and material ex- change between the building and surrounding environment，and to create a harmonious building environment with heat generation eco-system and wind eco-system．

Key words: passive energy-saving technology, Lingnan area, high-rise residential buildings, ecological perfor- mance