基于汉语语境下博士论文答辩及开题汇报答辩语料，本研究考察了“我想”“我认为”“我觉得” “我感觉”等认识立场标记及其变异形式的使用，发现除“我认为”之外，这些标记在两类答辩互动中的使用频次呈一致趋势。“我觉得”及其变异形式占比均很高；“我想”和“我感觉”比例均较低；“我认为”比例最低，只出现在论文答辩中。这些立场标记实施八种语用功能，这些功能在两类答辩互动中的频次有明显差异，这些标记在语用功能类型上也存在不均衡。

This study, based on the data from PhD dissertation (and proposal) defences, investigates the use of epistemic stance markers “wo xiang”(I think),“wo renwei”(I think),“wo juede”(I feel)and “wo ganjue”(I feel)and their variants in academic interaction in the Chinese context. It is found that these markers are used by committee members in the two types of defence interaction with a similar tendency except “wo renwei”. “Wo juede” and its variants occur with a much higher frequency than “wo xiang”,“wo ganjue” and their variants in each type of defence interaction; “wo renwei”,with a very low frequency, occurs only in PhD dissertation defences. Eight pragmatic functions can be performed by these markers in academic interaction and obvious differences exist between the two types of defence interaction in the occurrence of these pragmatic functions. In addition, differences can also be observed in the categories of pragmatic functions respectively performed by the four markers and their variants.