Institute of Geology, China Earthquake Administration's earthquake disaster and earthquake dynamics simulation system undertakes lots of computation tasks, such as processing of massive earthquake data and earthquake dynamics simulation. In this paper, we will introduce the construction objectives, system architecture, software environment, system operation and maintenance, system application etc., summarize the problems encountered during system operation and maintenance and corresponding solving measures, bring out a series of methods to optimize the parallel performance of HPC cluster system, and analyze the future development and improvement direction for our HPC cluster system.