Abstract This research aims to determine the ability to recognize letters in children aged 5-6 years before and after being given the Alphabet Pinwheel treatment at TK Negeri Pembina 1 Pekanbaru. This type of research is a quantitative experiment with a pre-experimental one group pretest posttest design. The population of the study is 140 children aged 5-6 years at TK Negeri Pembina 1 Pekan…