Abstract: 60 right-handed undergraduate students were selected as subjects (30 males and 30 females), the aim of this study was to search their autonomousmirror writing at stroke level in fourteen different writing patterns whenwriting rapidly. All subjects were randomly divided into two groups: Expe-riment group and contrast group (15 males and 15 females in each group).attention disturbance was given to the experiment group. The contents of wri-ting are: Arabic numeral 0-9 and one sentence consisting of thirteen Chinesecharacters. On the basis of the results in this study, a hypothesis of "homeo-stasis system" was proposed. The authors considered that the presentation ofmirror writing was caused by many factors. The important factors include:attention disturbance, feedback regulation of sense, the features of the con-tents of writing etc.

Key words: mirror writing, se1f MW ability, relating MW ability, motor programme, mirror motor programme, homeostasis system