Since the time consumption of full-result query for big data is excessively high, the system Probery was proposed. Different from traditional approximate query, Probery adopted an approximate full-result query method, an original method to query data. The approximation of Probery referred to the probability of containing all data satisfying query conditions in query results. Firstly, Probery divided the data stored in system into multiple data segments. Secondly, Probery placed the data in Distributed File System (DFS) according to the probability placing model. Finally, given a query condition, Probery adopted a heuristic query method to query data probably. The performance of query data was shown by comparing with other dominated non-relational data management system, in the case that the completeness of result set lost by 8%. The query time consumption of Probery was saved by 51% compared with HBase, by 23% compared with Cassandra, by 12% compared with MongoDB, by 3% compared with Hive. The experimental results show that Probery improves the performance of query data when the completeness of query data losses appropriately. In addition, Probery has better generality, adaptability and extensibility for big data query.