Abstract: Recovery rate is one of key parameters of natural gas resource evaluation, which is important to natural gas recoverable resource calculation. By the study of the natural gas type and the influence factor and the recovery rate of the different natural gas reservoir and so on, much achievement has obtained. First, according to their lithology and drive type, natural gas reservoirs are divided into gas drive-clastic reservoirs, water driveclastic reservoirs, gas drive-carbonate reservoirs, water drive-ar-bonate reservoirs, and tight reservoirs. Second, recovery rate is influenced by formation water activity, reservoir permeability,abandoned strata pressure, etc. Third, recovery rate of gas drive-clastic reservoirs is 75%-90%, water drive-clastic ones 50%- 70%, gas drive-carbonate ones 80% - 95%, water drive-carbonate ones 55% -80%, tight ones 40% - 55%.Forth, new standard stands the test of actual data of natural reservoirs. In the end, recovery rate of natural gas in 4 main gas-bearing basins are analyzed and the results are: recovery rate of natural gas in Sichuan Basin is 50% - 60%, Ordos 55%, Qaidam 50%-60%, Tarim 70%.

Key words: natural gas, resource evaluation, recovery rate