The decay of the excited states of the atomic nucleus is almost always companied by gamma radiation. Large gamma detection platform, which could give the most important observables of the nucleus, is proved to be one of the essential equipments of the laboratory around the world. A new detector array consisting of 32 detection element of the early phase, including 16 normal HPGe detectors, 8 Clover type HPGe detectors and 8 LaBr detectors, was constructed at Institute of Modern Physics of CAS in the 12th National Five-year period. It is one of the most efficient gamma detector arrays in Asia, with capability of measuring spectroscopy containing lifetime, and sustaining the most frontier nuclear study. In addition, reliable auxiliary equipments such as high speed/capacity electronic, DAQ, and automatic cooling system have been developed for the detector array. The array is currently serving at the TL2 beam line of the HIRFL facility for the in-beam gamma spectroscopy. It could also serve at the RIBLL and SHANS beam line for the study of radioactive and super-heavy nuclei.