This study is designed to prove the role and effect of ethics codes in professional societies, especially for scientists and engineers working in R&D project groups. The hypotheses of influence on ethical conduct within the sample groups are tested and analyzed by statistical methods. Results show that the age of researchers and the integrity factor among the ethical conduct factors have significant influence on ethical conduct of research groups. The regression model of the ethical conduct factors also indicates a meaningful reference in an application or development of new ethics code in research organizations.