In this study, we use case histories of the hospital to build a cloud clinical diagnostics aid system. Medical personnel can input medical records quickly and correctly by this system. This system can analyze case histories and provide the result to clinicians as references on diagnosis. Since clinicians usually interpret case histories based on their clinical experiences, the system designed in this study assists with the diagnosis. Clinicians can create an analytical chart after conditions input to the system and observe the data variation as well as the relationship among data displayed. This research offers clinicians a new and useful system that may contribute to the clinical diagnosis.