—This paper describes a collaborative lesson-preparing Platform, named Eduwiki, which supports a community of inservice teachers creating, sharing, and improving capacity of lesson-preparing. The main purpose of this study compares what method is good for lesson-preparing and explores what motivates or hinders teachers to do collaborative lesson-preparing. Findings suggest that compared with uploading lesson plans, collaborative lesson-preparing activity in Eduwiki adapts to teachers’ lesson-preparing. School leaders’ support and reciprocity appear to be the main motivators for teachers’ collaborative lesson-preparing, while lack of time and ICT skills appear to be the main barriers. The results of this study have proved that Eduwiki is an effective collaborative lesson-preparing platform and has important significance for the future application. Keywords-lesson-preparing; Eduwiki; uploading lesson plans; collaborative lesson-preparing ; motivators; barriers