沉默权作为一项完整的权利为侦查阶段的犯罪嫌疑人和审判阶段的被告人所共同享有。但是，目前在国内无论是学者还是实务工作者都很少有人从审判角度来考察沉默权问题，而仅仅局限在侦查阶段。本文主要运用诉讼职能区分原理来论证在审判阶段中要求被告人承担“如实陈述义务”的不合理性。 As a complete right, the right to silence is shared by criminal suspects in the investigation stage and defendants in the trial stage. However, few scholars and practitioners in our country study the issue of the right to silence from the perspective of trial at present, but only confine themselves to the stage of investigation. This paper mainly uses the principle of litigation function differentiation to demonstrate the irrationality of requiring the defendant to assume the obligation of truthfully presenting the statement in the trial stage.