This study will focus on which behaviors of students with autism cause the most problem for classroom teachers. The subtopics that will be addressed are about a general idea of the students with autism, their characters, their performances and attitudes in the classroom, behavior problems of students without disabilities, and the classroom teacher definition of problem behavior. Community, school, and families need more awareness about the students with autism because they have some characters and behaviors that might be dangerous and affect them and affect individuals around them. In addition, many relatives in Saudi Arabia have asked about students with autism; as a result, this work will try to find accurate answers of their questions. Moreover, this would help educators assist the students with autism and their families in Saudi Arabia. Scientists define the term autism spectrum disorder as a group of challenges behaviors, social skills, speech nonverbal communication, and repetitive behaviors, with differences between them (What Is Autism? 2018). Each student with autism has different characters and different issues. The behaviors students with autism sometimes have are mostly property destruction, physical aggression, self-injury, stereotypy, and tantrums. Such behaviors can put these young children at risk for exclusion from social, educational, family, and community activities.