Biological desulfurization process represented by S-P method belongs essentially to the oxidation-reduction method type. Compared with Stretford method and Lo-Cat method commonly used in industrγ，basically there is no such problem as solution foaming and blockage biological desulfurization unit. Due to the limitation of regeneration rate, design rapacity of S-P method biological desulfurization process unit is generally Iess than 0.2kg/m³. However, even in low sulfur capacity condition, mass concentration of byproduct sulfate produced from regeneration may be still as high as 5%. Therefore, the biological desulfurization technology is suitable for desulfurization of such atmospheric bioenergy gases as H₂S and C0₂, high purification degree is unnecessary for such gases, which is an important development trend of current gas purification technologies.