Abstract: In order to realize precise synchronization detection of signal phase for 2-D heterodyne interference displacement measurement, based on the combination of the whole cycle counting and the pulse stuffing methods, a dual-channel synchronous heterodyne signal phase measurement system based on field programmable gate array was designed and implemented by utilizing the same clock reference to detect synchronously and process the dual-channel signals parallelly. The results demonstrate that the resolution of 0.18 is realized with carrier frequency of 100kHz, and the phase synchronization measurement error of 0.18 is achieved for dual-channel signal detection. Accurate measurement of integral and fractional phases was realized by the system. Meanwhile, the real-time synchronous measurement of dual-channel signal phase was then guaranteed. It indicates that the developed system can fulfill the requirement of various 2-D heterodyne interference displacement measurement applications.