Abstract: In order to deal with the problem of difficulty of train parking at stop sign of station track in CTCS, from the view of operation scene analysis, this article used the method of mathematical model to analyze the reason about the normal train parking and difficulty of train parking at stop sign of station track, the content involved train control logic of on-board equipment, the position relationship among stop sign, responder group and protective signal. Taking CTCS-2 and CTCS-3 lines as an example, the article proposed the release speed control mode to solve the problems. The principle of release speed control function, some field application scenes as well as aggressive protective measures were introduced. The solution to the problem for each level of CTCS has extensive applicability.