Successful pain management relies on pain assessment. The purpose of this study is to investigate the effect of establishing pain committee on pain assessment skills of paediatric nurses. We used a quasi-experimental design. The study was conducted in surgery, emergency and orthopaedic wards of two teaching hospitals selected through simple random sampling. The intervention consisted of establishing a pain committee, the steps of which included organizing (3 months), holding workshop (five sessions) and clinical training (1 week). We found that the scores in the intervention group were significantly higher than those in the control group. Therefore, establishing pain committee in the management level of nursing improves nurses' pain assessment skills.