The concept of low-carbon development draws public attention. In order to fully tap the emission reduction potential, carbon trading is considered in scheduling. This paper propose a low-carbon economic scheduling model of integrated energy system considering ladder-type carbon trading. First, the model of the reward and punishment ladder-type carbon trading mechanism is established. Then, a low-carbon economic scheduling model of integrated energy system(IES) is proposed. Finally, a typical IES is used to verify the effectiveness of the model and a sensitive analysis is conducted to illustrate the relationship.