A method for providing poria cocos extract of K2 with an increment. The method comprises the following steps: (a) mixing poria cocos with a solvent to provide a first mixture； (b) alkalifying the first mixture to obtain a second mixture； (c) acidizing the second mixture to obtain a third mixture, (d) alkalifying the third mixture to obtain a fourth mixture with a pH value greater than 7； and (e) neutralizing the fourth mixture, wherein K2 is at least one of tumulosic acid, dehydrotumulosic acid, polyporenic acid C, and 3-epi-dehydrotumulosic acid.
