Abstract: The deficit in joint attention is an early predictor of children with Autism Spectrum Disorder (ASD). Training of joint attention has been a significant topic in ASD intervention. We propose a novel training approach using a Customizable Virtual Human (CVH) and a Virtual Reality (VR) game. We developed a CVH in an educational game – Imagination Drums – and conducted a user study on adolescents with high functioning ASD. The study results showed that the CVH makes the participants gaze less at the irrelevant area of the game’s storyline (i.e. background), but surprisingly, also provided evidence that participants react slower to the CVH’s joint attention bids, compared with Non-Customizable Virtual Humans.