Abstract: The pH value and water level of water were important factors affecting growth of crops.Simple water regime detection system could effectively realized real-time detection of water level and pH value，which have high precision and low cost.The system consists of 5 parts，power module，main control module，sensor module，display module and voltage detection module.It was based on Arduino board control，using dry battery or USB interface to supply power to system.Through sensor module，pH value and water level signal were transmitted to Arduino board for signal processing.Output voltage was measured by voltage detection module.It was convenient to use and timely control.