Usability of educational applications is essential for the effectiveness of the learning environment. Nowadays, these applications are developed on mobile devices since their use widespread rapidly. Considering these applications would be used by children, usability evaluation methods to be used would be different than conventional methods. In this study usability evaluation of a mobile hand-writing learning application was conducted by using heuristic evaluation method called Heuristic Evaluation for Child e-Learning (HECE) method. Evaluaton was conducted with three expert and two novice evaluators and critical usability problems were determined. The results of the study would guide the development of mobile applications for children as well as enabled the improvement of the mobile application.