This study explores the factors that trigger the technology leakage in small and medium sized enterprises(SMEs) from the behavioral viewpoint of an informant of technology. The empirical data from “2015 SMEs Technology Statistics Survey Report(STSSR)” conducted by the Small and Medium Business Administration and the Korea Federation of Small and Medium Business is employed in analysing Korean SMEs. STSST targeted at total 3,300 Korean domestic companies including 2,636 manufacturing, 664 non-manufacturing carrying out R&D currently at the moment of 31 December 2014. The main findings are as follows. First, the absence of a compensation system doest not exert an influence on the probability and the size of technology leakage going beyond the general idea that it is the primary factor of technology leakage by an internal informant. Second, the time required for immitative R&D by competitors does not result in technology leakage despite its significance for a strong motivation of technology leakage. Finally, the influence of a compensation system on technology leakage operates in association with the total time required for R&D. That is, without the differentiated compensation by the process of R&D, the probability and the size of technology leakage increase.