1. A method of producing particles with a low density, comprising the steps of: (i) obtaining a powder mixture containing a swellable agent； (ii) granulating the powder from step (i) with a lipophilic agent-containing solution for granulation into granules； (iii) drying the granules with stage (ii) .2. The method according to claim 1, further comprising a step (iv) of compressing the granules from step (iii). The method according to any one of claims 1 and 2, further comprising a step (v) of coating the granules obtained from step (ii) or step (iii). 4. The method according to any one of claims 1 and 2, wherein the active ingredient is added to the starting powder from step (i) and / or the granulation solution from step (ii), preferably to the starting powder from step (i), and / or applied to granules obtained in stage (iii) .5. The method according to any one of claims 1 and 2, wherein a binder is added with the starting material of step (i) and / or the granulation solution from step (ii), preferably in the starting powder from step (i). 6. The method according to any one of claims 1 and 2, wherein the swelling aid is a cellulose derivative with a molecular weight of from 4,000 to 2,000,000, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, superporous hydrogels； polyethylene oxides, polyethylene； polypropylene； polyvinyl chloride； polycarbonates； polystyrenes； polyacrylates； carboxyvinyl polymers； polyvinyl alcohols； glucans； scleroglucans； chitosans； mannans； galactomannans； gums； xanthan gums； carrageenans； amylase； alginic acids, acrylates, methacrylates, acrylic / methacrylic copolymers, polyanhydrides, polyamino acids, copolymers of methyl vinyl ethers and1. Способ получения частиц с низкой плотностью, включающий стадии:(i) получения порошковой смеси, содержащей способствующее разбуханию средство；(ii) гранулирования порошка со стадии (i) с содержащим липофильное средство раствором для гранулирования в гранулы；(iii) высушивани
