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Spacecraft test data has typical big data characteristic, and is critical to evaluations and decisions made in spacecraft development. In order to achieve efficient and effective acquisition, storage, processing, analysis and application of spacecraft test data, the characteristic of spacecraft test data was analyzed, the big data system for spacecraft test was built, the deployment position was given. The system architecture is based on technology of Hadoop, Flume, Kafka, MongoDB, HDFS, Spark Streaming, Presto, Kylin .etc, and composed of data acquisition layer, data storage layer, data processing layer, data analysis layer, data access layer and data application layer. The implementation approach of each layer was investigated. Typical application and prospect were discussed, such as real-time monitoring, health evaluation, test validity evaluation, reliability assessment and life time forecast, knowledge discovery, virtual test .etc.