The paper studied the questioning on the court, and further described the strategy of courtroom questions.

Based on relevant theories of presupposition,the paper aims to study the linguistic features of courtroom interaction and endeavors to show how presupposition is realized in courtroom interaction and how a favorable effect is made for parties in a trial.

Speech act is the philosophical starting point of all linguistic phenomena including courtroom discourse,which is made up of a clustering of various speech acts and is highly extemporaneous,interactive and dynamic as a functional register of institutional discourse.

Recently the study of courtroom discourse has been the focus of forensic linguistics.

At present, the research on the legal language in our country is mostly concentrated on the static description, studying the legal language itself from the syntax or semantic angle, but lack the dynamic study, let alone the study and research on the combination of pragmatic theories and courtroom discourse.

The present study concentrates on pragmatic vagueness as a strategy in Chinese courtroom response.

The language used in the law court interrogation is a special kind of legal language,not only with request of nicety,but also with presence of fuzziness.