Background: Time Perception is an important performance that facilitates ability to anticipate future and efficiency of respond to happening events. The aim of this study is to compare the features of time perception in three subtypes of Attention Deficit/Hyperactivity Disorder (ADHD).

Method: The study was descriptive and causal-comparative. The study population includes all primary school children with attention deficit / hyperactivity disorder in girls' schools in 2016 in Sirjan. The sample consists of 69 children with attention deficit / hyperactivity disorder, which were selected by purposive sampling. To collect data, Achenbach conduct disorder questionnaire and three task estimates, the production of the time was used. The data were analyzed using descriptive statistics, ANOVA and Tukey test.

Result: The results showed that there is a significant difference between the three sub-types of Attention Deficit / Hyperactivity in the task of time estimation (p <0/003). The finding also showed that there is no significant difference between the three types of Attention Deficit / Hyperactivity Disorder in the task of production and reproduction time (p> 0/258).

Conclusion: Based on the findings, time perception is difference in sub-type of attention deficit/ hyperactivity disorders.