In order to improve precision and efficiency of measuring pavement deflection in the transport area of China, a measuring machine based on embedded operating system μC/OS-II is designed with LPC2214 MCU. In the design, wireless communication technology, embedded technology, filter technology of software and hardware, anti-jamming technology and other advanced technologies are applied. The machine is divided into two parts: main-machine and sub-machine. The former is used to measure voltages from laser displacement, which will be sent to main-machine from wireless communication channel. The lather is used to calculate, store, display and print the deflection value. All the deflection heights and results will be sent to PC, which can be processed in further. Based on the machine, many experiments are carried out on different highways. The experiment results showed that error of road deflection was below 0.01mm and consuming time for each test was about 60 seconds.