The invention discloses a precomputation method based on Lucene. The precomputation method comprises the following steps: S1, setting a data processing mode; S2, loading data; S3, processing the data;and S4, storing the data; according to the method, the maximum time can be changed in a limited space, and good statistical analysis performance can be obtained; meanwhile, the powerful retrieval function of the Lucene is reserved, so that the Lucene becomes more complete, and the functions are more diversified; wherein the final storage format of the file is based on the original payload of Lucene, and the Lucene is used for expanding various functions; lucene does not have the precomputation capability, and a large number of CPU and io resources are consumed during computation.