The invention discloses an interface system between a (Central Traffic Control) and an RBC (Radio Block Center). The interface system comprises two RBC interface servers, two switches, two isolation devices and a communication cable; the RBC interface servers perform protocol conversion on received CTC data so as to make the CTC data satisfy the an RBC-CTC interface protocol; the data are transmitted to the RBC through the switches and the isolation devices; RBC data are sent to the RBC interface servers through the isolation devices and the switches; and the RBC interface servers perform protocol conversion on the RBC data and send the data to the CTC after the data meet a format required by the CTC. With the interface system of the invention adopted, an interface connection between the CTC and the RBC is realized, so that the CTC can obtain train information, diagnosis information, connection alarm and the like from the RBC, and can send information such as time check information tothe RBC; and the information can help a dispatching commander to master train statuses in real time, so that the dispatching commander can complete train dispatching and commanding work in a timely and effective manner.