For a smooth life cycle, one has to match his/her energy field to their house (where they spend most of their time) and their work place.
http://wenda.tianya.cn/wenda/thread?tid=7da2325549d506c1
One type of Li Qi Feng Shui is Ba Zai and the other is Fei Xing (Flying Stars)
Feng Shui Ba Zhai is a method using numerology to estimate the luck cycle and energy of your house. Ba Zhai is within one of the 8 classes of feng shui which determines energy (气). It is a common method used by practitioners and favoured by Hong Kong. The reason being its simplicity to apply.
Ba Zhai uses the Earth Ba Gua (后天) and divides into 9 sections.
North = 1 = Water = Kan Gua 北宫 坎(水)
South West = 2 = Earth = Kun Gua 西南宫 坤(土)
East = 3 = Wood = Zhen Gua = 东宫 震(木)
South East = 4 = Wind = Shun Gua = 东南宫 巽(木)
Middle = 5 = Earth = Male Kun Gua / Female Gen Gua = 中宫 男坤女艮(土)
North West = 6 = Metal = Qian Gua = 西北宫 乾(金)
West = 7 = Metal = Dui Gua = 西宫 兑(金)
North East = 8 = Earth = Gen Gua = 东北宫 艮(土)
South = 9 = Fire = Li Gua = 南宫 离(火)
Calculation
Male is to get the remainder of (100 – Last 2 digits of year of birth) ÷ 9,
1988 is (100 – 88) ÷ 9 = 3 = East Zhen Gua 震
Female is to get remainder of (Last 2 digits of year of birth – 4) ÷ 9,
1987 is (87-4) ÷ 9 = 2 = Earth Kun Gua 坤
Every 180 years is divided into 3 parts of 60 years: Upper cycle, Middle cycle, and Lower cycle (元). Every cycle has 3 sections (运) of 20 years.
Upper cycle: 1st 2nd 3rd
Middle cycle: 4th 5th 6th
Lower cycle: 7th 8th 9th
This year is from 2003 – 2023 which is the 8th section (Earth Gen Gua). Thus on Gen Gua facing Kun Gua houses are in luck.
Ba Zhai uses Nine Flying Stars using cycle, year and month, together with Ba Gua. There are 8 classes of houses which is 4 in East group and 4 in West group.
In the house there are 4 good directions and 4 bad directions.
生气，为贪狼星，大吉
延年，为武曲星，中吉
天医，为巨门星，次吉
伏位，为左辅星，小吉
祸害，为禄存星，小凶
六煞，为文曲星，次凶
五鬼，为廉贞星，大凶
绝命，为破军星，至凶
Reference
http://baike.baidu.com/view/289974.html?fromTaglist
八宅明镜
紫薇飞星