This study analyzed 103 general education teachers’ perceptions on the causes of learning problems and effective instructional methods for the four types of students including students with learning disabilities(LD), intellectual disabilities(ID), under-achieving, and normal achievement. For this, this study developed 20 questions to explore the causes of learning problems and 8 items for identifying the effective instructional methods for each type of students. According to the key results, the learning problems caused by low IQ, much use of game․computer․mobile-phone, lack of motivation to learn, and lack of basic math skills were found to be important factors influencing on students' learning problems. Teachers perceived that normal and under-achieving students’ learning problems were more by environmental conditions, however, students with LD and ID’s problems were more by students’ intrinsic problems. According the effective instructional methods, teachers perceived that small group cooperative learning, problem-based learning, and peer-tutoring need to be used for under-achieving and normal achieving students. On the other hand, individualized learning, exploratory teaching, and regularly repeated practice were perceived more generally effective teaching ways for all types of students.