Flashcard is a learning tool that is not only inexpensive but also extremely useful and convenient. Teachers or students can carry it everywhere and study at any time with free time even if it is 5-10 minutes instead of having to carry many books or notebooks. Teaching becomes easy and helps students learn while playing quickly and remember longer. In particular, it can be applied well to Biology in general and Cell Biology in particular. This article deals with the problem of designing and using flashcard in teaching Cell Biology in high school.