Abstract:To make the data measured by the electronic sphygmomanometer reliably saved, this system uses the avr microcontroller, pressure sensor,liquid crystal display and Bluetooth module. It is made to measure people's heart rate and blood pressure and is able to send the result data to a phone via Bluetooth. The phone can save the data and draw a line graph, and give an appropriate assessment. The result can be sent to others' (doctor' s e.g.) phone by message. This design has many advantages such as low-cost, low-power, easy to carry,easy to use and so on.