This thesis initiates from the empirical researches findings which indicate that cognition-action gap exists in knowledge sharing practice. In order to have a deep insight, the researcher conducts a phenomenological qualitative research to explore the context behind this phenomenon. We adopt phenomenological interview technique to explore the lived experience concerning knowledge sharing in knowledge management systems (KMS) called SCTNet. We interview forty-nine teachers who register as the members on SCTNet and are located in different cities in Taiwan. Research findings show that the meaning of knowledge that teachers perceive are¡G the techniques and lived experiences accumulated from the interactions with children¡¦s parents and children, teaching professions and designs, and the beliefs in teaching. The teachers perceive knowledge sharing as the transit power in transforming oneself from alone to belong to the teacher¡¦s professional community and helps oneself expands his/her experience from limited into broader. We find that teachers¡¦ interaction happened in five different fields in the school. These are the places of workshop, demo, gossiping, apprenticeship learning, and ¡§the space between you and me¡¨. In each field, there exist different phenomena of interactions. In the fields of workshop, demo, gossiping and apprenticeship learning, most of the interactions are perceived as a ¡§form of play¡¨, and only little lived experience is shared in these places. Most of lived experience sharing and learning happen in ¡§the space between you and me¡¨. Research findings indicate that the constrains frame these teachers in speaking out of their lived experience are¡Gthe norms of teacher society, busyness, and loneness. These teachers show their desires in looking for ¡§others¡¨ as the learning and sharing partners in SCTNet. Yet, they show different participation phenomena while they present themselves in the virtual space and these phenomena outline two forums for interaction in SCTNet. One of them is ¡§Smart¡¨ platform and another is ¡§Outside¡¨. On the ¡§Smart¡¨ platform, teachers perceive themselves as smart teachers and show strong group identity to this platform, share their lived experience actively, and always give support while partners need. They defense against outsiders while others criticize their platform. However, the members and their behaviors in sharing on ¡§Smart¡¨ platform are through the security check and guaranteed the sharings are safe. The phenomena in ¡§Outside¡¨ show that most of the participants keep quiet or with few interactions to hide themselves from the ¡¨others¡¨ on SCTNet. In this area, a lot of teaching materials are stored and used by the novices or the travelers on the virtual space. Sometimes, ¡§Outside¡¨ serves as the communication channel of the educational administration for transfering the documentations. Yet, with the administration intervention, participants are encouraged to submit or post some materials upon the ¡§quantity¡¨ request. This makes the SCTNet under the risk of becoming an information junkyard (McDermot 1994). Research findings also indicate the factors which serve as obstructs, exits, and projections that teachers tour around the physical and virtual space. At the end, several reflections are proposed from the perspectives of educational contexts, teachers, and information technologies for constructing the knowledge management systems.