Abstract: The formation property of the foundation pit was poor.The upper was mucky silty clay and the lower was silt.The surrounding architectural environment was complex.According to formation and the surrounding environment, support scheme of bored piles, steel supports and high pressure jet grouting piles was made.Monitoring based on standard played an important role in guiding excavation.Monitoring results which were analyzed and compared with calculated value showed that support design of the foundation pit was reasonable.The results provided reference for other foundation pit design and monitoring.