This is a multi-center, randomized, controlled trial to compare the efficacy of two therapies for patients with severe CAP. 198 subjects will be randomly assigned to one therapies (conventional drug, and the combination of conventional drug and TCM) for 28 days treatment. After the treatment period, subjects in two arms will be followed up for 12 weeks. The primary outcomes will include treatment failure, and secondary outcomes Time to clinical stability, length hospital stays, in-hospital mortality, SOFA questionnaire, quality of life (CAP-PRO ) and health economics.