             The purposes of this study were 1) to investigate conditions and problems on communication competency of leaders in small and middle enterprises of contraction service business 2) to investigate communication competency factors of leaders in small and medium enterprises of contraction service business, and 3) to develop communication competency model for leaders in small and medium enterprises of contraction service business. This study utilized mixed methodology of quantitative and qualitative research. The researcher collected data by interviewing 8 enterprise leaders, inquiring 17 experts using Delphi technique, organizing focus group consisting of 9 members, and distributing questionnaires to the sampling group in Chachoengsao Province comprising of 430 people from 430 enterprises. The statistics used for data analysis were median, inter-quartiles range, mean and standard deviation.
             The results of the study revealed that 1) the conditions and problems on communication competency: communication process, communication model in organization, level of communication, and capability in communication, were at maximum level. 2) communication competency factor of leaders in small and medium enterprises of contraction service business comprised of 3 aspects i.e. core competency, management competency, organization communication competency, and 3) the model of communication competency of leaders in small and middle enterprises of contraction service business comprised of communication process, communication model in organization, level of communication, and communication competency of leaders in organization.
