The operation of every commercial store is inseparable from the function and influence of geomantic omen. In geomantic omen, there are indoor geomantic omen and outdoor gas field, and color belongs to an acquired artificial gas field geomantic omen. In the outdoor color geomantic omen of shops, indoor furnishings should be consistent with outdoor colors, so as to promote the geomantic omen of shops, such as red for jewelry shops, green for fruit shops, simple yellow for porcelain shops and so on. Brighter colors such as red and yellow will make people more excited and arouse people's desire to buy.