Aiming at the problem that fresh food suppliers are faced with increasing fresh-keeping investment but limited free carbon emission, using the consumer utility theory, a channel selection model for fresh food suppliers under carbon trading is constructed, including single entity channel, single network channel and dual channel. The reverse induction method is used to obtain the optimal supplier decision of the three channels by analyzing the impacts of fresh-keeping investment cost coefficient, consumers’preference for freshness and carbon trading price on the optimal decision of fresh food suppliers under different channels. The study finds that with the goal of maximizing the fresh food supplier’s carbon revenue, the optimal channel selection is the single entity channel, but the market demand will be reduced, while with the goal of maximizing the fresh food supplier’s profit, the optimal channel selection is the dual channel.