Low carbon economy is gradually achieving global consensus by increasing number of countries. It is the basic way to address climate change and coordinate socio-economic development. The low carbon road with Chinese characteristic is the hotspot of academic research and it is a great challenge too. But few scholars did researches in low-carbon economy development from consumer preference. This paper analyzed the dual utility structure characteristic of low-carbon products from the perspective of low carbon products preference. According to consumer behavior theory, it concludes consumers have ultra-satisfaction consumption preference towards low-carbon products. The utility function has a positive real root which is not one. The paper hopes to provide the theoretical basis for analyzing market demand of low-carbon economy with the model.