Abstract: Breakthroughs have been made in the Permian tight conglomerate in Manan area in Junggar Basin. The systematic reservoir study is conducted by using various data of drilled wells to identify the main characteristics and favorable conditions for forming reservoir. The study results show that the reservoir is mainly composed of conglomerates of fan delta distributary channel facies, which shows a tight conglomerate reservoir with low-ultra low porosity and low-ultra low permeability, and medium textural maturity; The main composition of the gravel is tuff, with low compositional maturity, and the cements are dominated by laumontite and calcite; The pores mainly include intragranular dissolution pores of feldspar and dark minerals, as well as intergranular dissolution pores of zeolite and carbonate cements, and the fractures are relatively well developed, jointly forming an effective reservoir system; Two secondary pore zones are observed at intervals 3200-3840 m and 4200-5200 m, and both are located in the abnormal high pressure zone. The diagenesis, fractures and abnormal high pressure are favorable conditions for forming effective tight conglomerate reservoir in the Permian.