“…Within this extent, the author of the present study focused on discovering a native, indigenous model of in-service training plan based on Cambodian insiders" experience and their expectation. The existing studies such as Fregusson and Massion (1997), Fujigaki (2002), Tan (2007), Duggan (1996), Kitamura (2008), Kim andRouse (2011), Khlork (2001), Chhinh (2002), Chhinh andTabata (2003), Courtney (2007), Tan and Ng (2012), Berkvens (2009), Prigent, 2016and Kuroda, Kartika and Kitamura (2017 depicted: education officials" awareness of prior tasks, conducting further study on qualified teachers in dense and spare areas, improving teaching service conditions, further exanimating the relation of untrained teachers and low literacy and numeracy of children, recognizing the effectiveness of aids and decentralization against the lack of capacity of local officials to manage, clarifying teacher"s role and acknowledging the development and training opportunities, raising teacher capacity through establishing standard of pre-service teacher training -for example: training at university for bachelor degree or even higher to master degree, raising teacher quality through in-service training programs, elaborating messy system of teacher training and unreached outcomes, observing in-service training program if it virtually contributes to the success of education reform, strengthening competence of teacher trainers on how to use facilities and content of the training which influence on the level of quality of trainees, spending more time not just on academic knowledge upgrading during inservice training program, creating and sustaining ongoing professional learning routine of teachers, making proper use of aids to strengthening weak policy and practice in professional development -for example: to develop skills of officials at ministry level-while there requires having personal commitment, personal willingness and ability to learn in addition to amount of supports from outsiders.…”