Environment on Earth has more variance tends to make the Dolphins need to modify the behavior of the environment. Lead to difficulties in monitoring the well-being of dolphins by a group of people who are interested. To study the behavior of the dolphins. Therefore, the researcher has worked researching dolphins behavior in Don Sak Sea. Were prepared by the Technical Association Ignore the Tuple used in forecasting algorithm PredictiveApriori concluded that the turbidity level of 2.01-3 m at 26-31 ppt salinity and sunny weather. Indo-Pacific Humpback Dolphin species are found the behavior childcare and play, the turbidity level of 2.01-3 m at 32-37 ppt salinity and sunny weather. Indo-Pacific Humpback Dolphin species are found a travelling behavior. And the turbidity level at 0-1 m at 26-31 ppt salinity and weather is sunny. Indo-Pacific Humpback Dolphin species are found the behavior hunting.