This research is proposed 1) to investigate status state, problems, and needs in doing classroom action research of teachers, 2) to guideline the development of classroom action research of teachers, and 3) to monitor and evaluation the guideline of classroom action research development of teachers. Sampling were 8 teachers of Wat Wangyang School under NakhonSawan Primary Educational Service Office Area 1which came from purposive method. This research was mixed research method and conducted during June 2021 to April 2022 by Participatory Action Research (PAR) in 4 steps: Planning, Action, Monitoring and Reflection. Tools used in data collection were status state, problems, and needs in doing classroom actionresearch questionnaire of teachers; structured interview form; supervision, monitoring record and evaluation form of classroom actionresearch; classroomaction research test; and classroom actionresearch evaluation form. Analysis of quantitative data used Percentage, Mean, and Standard Deviation. Analysis of qualitative data used descriptive statistics. Research found that, 1) teachers of Wat Wangyang School have status state in classroom action research in bottom level, have highest level in problems and needs, 2) the guideline of classroom action research development of teachers of Wat Wangyang School showed that 2.1) to organized the workshop training in formal 5 Chapters of classroom actionresearch by scholar with experienced in classroom research, 2.2) teachers are conducting classroom actionresearch follow the research steps, and) monitoring and evaluating the guideline of classroom actionresearch found that teachers have better understanding in classroom in post workshop than before workshop and have 8 classroom actionresearch with high quality of work.