Background and Purpose: Children with developmental coordination disorder (DCD) perform poorly in motor skills, postural control and acquisition of balance-related skills. Therefore, they tend to withdraw from participating physical activity. Such situation may end in a vicious cycle of low motor activity and physical unfitness. It is important to find a solution to encourage these children to engage more in physical activities. The aim of this study was to examine the effect of a self-developed video game (iBalance) on balance skills in preschool children with DCD. Methods: Preschool children with DCD were recruited for this study. They received test with Peabody Picture Vocabulary Test, Movement Assessment Battery for Children-2nd edition (MABC-2) and iBalance Assessment before the training. The training program was executed for 45 min/time, 2 times/week and for 4 weeks. The outcome measures were MABC-2 score, numbers of success, COP trajectory and COP velocity. Results: In this preliminary report, only 3 preschool children completed the training session and outcome measures. It showed that all 3 children had obvious improvement on MABC-2 percentile rank of balance component and numbers of success of the iBalance game. The variables of COP trajectory and COP velocity of 2 children had the same trend which showed a decrease in COP trajectory and velocity. However, another one child showed the opposite trend. Conclusion: The sample size is too small to make a conclusion. We anticipate to having a positive result when we finish all the data collection of the participants. Clinical Relevance: The outcome may provide us an understanding of the effect of iBalance training on balance skills in preschool children with DCD and provide clinicians another choice of balance training program.