For the insufficient water absorbing capacity of oilfield water injection well, the fracturing should be carried out to increase such water absorbing capacity of formation. During the process of fracturing, the applied pressure is the strictly required, so it’s very important to detect the pressure changes of fracturing for the expected results to be realized. For the complexity of formation in which the fracturing occurs, the requirements on pressure gauge is high, such as the high pressure proof, high accuracy, high anti-vibration, high anti-corrosion, high reliability, etc.. The electronic pressure gauge is inside the pressure gauge carrier (a downhole tool) to monitor the pressure changes and fracturing process of water injection well. The pressure gauge carrier is connected with fracturing tool for the protection of the gauge.