Utilizing the latest embedded technology, we built an ARM-Linux embedded development platform and a portable γ ray spectrometer which can undertake multitasking and has powerful real-time performance,low power consumption. Firstly, a multi-channel pulse amplitude analyzer was designed, and then both the A/D transition driver module and multi-channel pulse amplitude analyzer interface drivers were developped. Finally using QT/E lib, a software that can analyse and process spectrum data was also developped. Base on the above development, localization of time and space was also integrated in the spectrometer with GPS module.