Conclusions:Miniature probe of 7.5MHz and 15 MHz can determine the size,quality,layer of origin and constitution of proximal organise of oesophagus and submucosal lesion.

• :7.；5MHz和 15MHz微探头能够明确食管和胃肠粘膜下病变的大小、性质、起源层次及与邻近组织结构关系 ;