This study as a series of the previous study, "A Study on the Methodology for Planning Safety Prevention, " is to find out what method will be the best for efficient safety instruction using a questionware with the five questions. Based on the answers from directly working labors, this study has been processed with procedures as follows； 1) Review on general safety instruction. 2) Distribute questionwares to only on-the-job labors. 3) Analyze the results from questionwares. 4) Conclude efficient method from the results analyed.