A method of preparing and analysing granules comprising a composition of Ramulus cinnamomi and Poria cocos, comprising the steps of: (a) Grinding Poria cocos into fine powder to give Poria cocos powder; (b) Extracting Cortex moutan (common name: Tree Peony Bark; Chinese name: Mu Dan Pi) by steam distillation to give a Paeonol extract; (c) Extracting the extracted raw material from step (b) with ethanol to give Extract I, and then extracting said raw material again with hot water to give Extract II; (d) Extracting Ramulus cinnamomi by steam distillation to give a volatile oil; (e) Extracting the extracted material from step (d) with ethanol to give Extract III, and then extracting said raw material again with hot water to give Extract IV; (f) Extracting Radix paeoniae alba, Semen persicae (common name: Peach Seed; Chinese name: Tao Ren), and Poria cocos with ethanol to give Extract V, and then with hot water to give Extract VI; (g) Combining Extracts I, III and V, and removing all ethanol to give Liquid A; (h) Combining Extracts II, IV and VI, and concentrating the combined extracts to give Liquid B; (i) Combining Liquids A and B, and concentrating the liquids to give a Semisolid Extract with a relative density equal to 1.15-1.35 (60-90°C); (j) Dissolving the Paeonol extract from step (b) in ethanol, and adding the solution to an aqueous solution of β-cyclodextrin, wherein the mixture is grinded and dried to give Inclusion Substance I; (k) Mixing the volatile oil from Step (d) with β-cyclodextrin in ethanol, wherein the mixture is grinded and dried to give Inclusion Substance II; (l) Mixing the Poria cocos Powder from step (a) with the Semisolid Extract from step (i), wherein the mixture is dried and grinded into fine powders; (m) Mixing the fine powders from step with Inclusion Substances I and II, adding ethanol to the mixture to make a dough-like mass, and passing the wet material through a sieve to obtain granules; (n) Drying said granules, and passing the dried granules through the sieve again to give final granules of Ramulus cinnamomi and Poria cocos; and (o) extracting the granules with an organic solvent comprising 50% methanol, and performing high performance liquid chromatography analysis using a C18 column, wherein Paeoniflorin is used as a standard in the chromatographic analysis, wherein the analysis produces 12 peaks, wherein the high performance liquid chromatography is performed at a flow rate of 1 ml/min, the elution is a gradient elution from 100% Mobile Phase A to 100% Mobile Phase B over a period of 70 minutes, wherein the Mobile Phase A is an aqueous solution containing 0.1% phosphoric acid and 5% acetonitrile, the Mobile Phase B is an aqueous solution containing 0.1% phosphoric acid and 50% acetonitrile, and the peaks are monitored at a wavelength of 230 nm. (a) Grinding Poria cocos into fine powder to give Poria cocos powder; (b) Extracting Cortex moutan (common name: Tree Peony Bark; Chinese name: Mu Dan Pi) by steam distillation to give a Paeonol extract; (c) Extracting the extracted raw material from step (b) with ethanol to give Extract I, and then extracting said raw material again with hot water to give Extract II; (d) Extracting Ramulus cinnamomi by steam distillation to give a volatile oil; (e) Extracting the extracted material from step (d) with ethanol to give Extract III, and then extracting said raw material again with hot water to give Extract IV; (f) Extracting Radix paeoniae alba, Semen persicae (common name: Peach Seed; Chinese name: Tao Ren), and Poria cocos with ethanol to give Extract V, and then with hot water to give Extract VI; (g) Combining Extracts I, III and V, and removing all ethanol to give Liquid A; (h) Combining Extracts II, IV and VI, and concentrating the combined extracts to give Liquid B; (i) Combining Liquids A and B, and concentrating the liquids to give a Semisolid Extract with a relative density equal to 1.15-1.35 (60-90°C); (j) Dissolving the Paeonol extract from step (b) in ethanol, and adding the solution to an aqueous solution of β-cyclodextrin, wherein the mixture is grinded and dried to give Inclusion Substance I; (k) Mixing the volatile oil from Step (d) with β-cyclodextrin in ethanol, wherein the mixture is grinded and dried to give Inclusion Substance II; (l) Mixing the Poria cocos Powder from step (a) with the Semisolid Extract from step (i), wherein the mixture is dried and grinded into fine powders; (m) Mixing the fine powders from step with Inclusion Substances I and II, adding ethanol to the mixture to make a dough-like mass, and passing the wet material through a sieve to obtain granules; (n) Drying said granules, and passing the dried granules through the sieve again to give final granules of Ramulus cinnamomi and Poria cocos; and (o) extracting the granules with an organic solvent comprising 50% methanol, and performing high performance liquid chromatography analysis using a C18 column, wherein Paeoniflorin is used as a standard in the chromatographic analysis, wherein the analysis produces 12 peaks, wherein the high performance liquid chromatography is performed at a flow rate of 1 ml/min, the elution is a gradient elution from 100% Mobile Phase A to 100% Mobile Phase B over a period of 70 minutes, wherein the Mobile Phase A is an aqueous solution containing 0.1% phosphoric acid and 5% acetonitrile, the Mobile Phase B is an aqueous solution containing 0.1% phosphoric acid and 50% acetonitrile, and the peaks are monitored at a wavelength of 230 nm.