The application of Bluetooth on the pH sensor was accomplished.Based on the experimental results,Bluetooth technology was used to measure pH values without limiting the distance.Moreover,Biuetooth technology provides low power, low cost and small volume,therefore,it can increase the practicability of the system.In this investigation,the pH value was detected by the SnO_2/ITO glass-based pH sensor.During the signal progress,the detected signal was transferred to the microchip PIC18.After that,the microchip was able to communicate with PC by the Bluetooth.Moreover,the microchip can diagnose the sensing signal and sends the warning signal by alert function.In addition,the part of PC has the ability to record the information,builds the database for analyzing the pH values,and provides a better long-distance monitoring system. The application of Bluetooth on the pH sensor was accomplished. Based on the experimental results, Bluetooth technology was used to measure pH values ​​without limiting the distance. Moreover, Biuetooth technology provides low power, low cost and small volume, therefore, it can increase the practicability of the system. In this investigation, the pH value was detected by the SnO 2 / ITO glass-based pH sensor. Drawing the signal progress, the detected signal was transferred to the microchip PIC 18. After that, the microchip was able to communicate with PC by the Bluetooth. Moreover, the microchip can diagnose the sensing signal and sends the warning signal by alert function. Addition, the part of PC has the ability to record the information, builds the database for analyzing the pH values, and provides a better long-distance monitoring system.