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Recently as the demand of smart devices increases, the porting of embedded operating systems such as Google Android, Microsoft Windows Mobile, and Embedded Linux, becomes more important. Consequently, the importance of efficient, systematic porting is also raised. Generally, developers initiate embedded operating system porting from getting operating system source codes and materials. After they get source codes, they modify the source codes, and then they test them. To identify porting in detail, we investigated a small porting team which has fifteen members. In this team, each developer has done porting depending on his or her knowledge and experience. Therefore, we tried to find studies for efficient, systematic porting, but we couldn't find sufficient study results. This study aims to analyze porting process in a small organization. Also, we'll suggest productive a porting process and evaluate productivity of the new process through a case study.