In the Inertial Confinement Fusion (ICF) research, KrF laser is considered to be a promising candidate for the reactor driver due to its short wavelength, wide bandwidth, high efficiency, scalability, and advantages of UV laser in laser -plasma coupling. This paper describes some performance of 100J level multistage KrF laser system "Heaven-I". This high power KrF excimer laser system is under development in China Institute of Atomic Energy (CIAE). As a first phase, the angular multiplexing Master Oscillator and Power Amplifier (MOPA) will be completed and used for fundamental research of ICF driver and laser plasma interaction in this year. This multiplexing MOPA system includes a front-end with a spatial filter, two stages KrF amplifiers pumped by electron beams, an optical angular multiplexing system, laser trigger switches and synchronization trigger system, controlling-data acquisition system and some electron and laser diagnostic system. The 100J/23ns laser output has been obtained in this multiplexing MOPA system. The recent progress and some results of this multiplexing MOPA system are described in this paper.
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