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Abstract. This study is aimed to identify the Computer Assisted Instruction (CAI) based on learning as an instructional need for students- conceptual understanding about water cycle. Qualitative descriptive method was used in this study. The data collection used observation, interviews, and tests. Participants were three students average 11-13 years old. The multimedia-based CAI application used by the researcher to understand pupils- conceptual understanding of the water cycle is implemented on laptops or desktop computers used Windows operating system. The result showed that pupils- conceptual understanding of the water cycle are still lack and many misconceptions can be seen from the results of student work when drawing water cycles. The sustainable development will be achieved if the instructional needs through improvement of CAI are fulfilled.