The DNA fragment coding the third P region of α1B subunit of N-type voltage-gated calcium channel of Rattus norvegicus (Cav22P for short) was amplified by high fidelity PCR, inserted into vectors pET28b and pGEX-4T-1 respectively, and expressed in Escherichia coli Rosetta. The expressed product HIS-Cav22P mostly deposited in an inclusive body. The inclusive body of HIS-Cav22P dissolved in urea buffer. After dilution and dialysis, the refolded protein HIS-Cav22P was finally purified via Histrap chelating HP column. Ultraviolet spectroscopy results demonstrated that HIS-Cav22P protein can bind to calcium ions reversely. The expressed product GST-Cav22P was purified from the supernatant of cell lysate using Glutathione Sepharose 4B column. However, GST-Cav22P degraded severely, which caused it difficult to purify the protein Cav22P and the GST pull-down assay. All the results suggest that the active recombinant proteins of Cav22P may act as a molecular target for high through screen of non-narcotic analgesic drugs.