srjecsSRJECSSRJECS2788-9408https://doi.org/10.47310/srjecs.2022.v02i01.011Building a Supporting System for Water Fishing Application 4.0 TechnologyAnhMai ThiKimHangDaoThiResearch results in the article with the goal of building a support system for freshwater fish farming applying RF wireless communication technology combined with the application of 4.0 technology. The system of applying communication technology does not wake up, using solar energy in accordance with the conditions of rivers and lakes in the field of aquaculture. Integrated measurement technology, remote monitoring control via internet and computer network. The system works stably and accurately; the data synchronization process of the whole system is 100% accurate. The test results of the system with 02 parameters are cation amoni () and pH concentration with the same sample with an error from 0,01 to 0,03 between measurements. The system gives warnings when the environmental indicators exceed the specified level and automatically activates the systems to change the indicators to bring them back to a safe level. The research results can be applied in the field of freshwater fish farming and aquaculture.