Since the Technical Guideline on Compatibility Study of Chemicals and Elastomeric Closures was published by the National Medical Products Administration (NMPA, previously known as CFDA) in April 2018, it is essential for pharmaceutical companies to perform compatibility studies. However, for some domestic pharmaceutical companies that lack experience, it is unclear how to perform such a study. To address this, a series of trainings was planned by China National Pharmaceutical Packaging Association (CNPPA) – with the first held in December 2018. There were over 100 attendees from pharmaceutical companies, pharmaceutical packaging companies, NMPA-affiliated labs, and the third-party labs. The training received positive feedback from the participants.