ACES Sunday classes were created in 2007. All Sunday classes are held in the afternoon. Sunday school includes bilingual classes, pre-Kindergarten classes, and classes catered for students 1st – 8th grade. Textbook materials include KuaiLe Han Yu《快乐汉语》, YouEr Han Yu《幼儿汉语》，Si Wu Kuai Du《四五快读》 and Liping Ma《马立平教材》.
All instructors are consistent, experienced and extremely patient towards all students. 90% of all Sunday class instructors are also instructors of the ACES afterschool Chinese program. For many of the instructors, ACES is their only job. Therefore, these instructors are dedicated and focused to their work at ACES Learning Center.