The method for preparing 3 α-7 α (β)-- 6 α of bis-hydroxy (β)-- 5 β of alkyl-cholanic acid (I) and-6-5 β of alpha-alkyl-7- ketone group of 3 Alpha-hydroxy of relevant intermediate product-cholanic acid (VIII) and 3 Alpha-hydroxy-6-5 β of alpha-alkyl-7- ketone group-cholanic acid (Ⅸ) with what, wherein R is the C1-C5 alkyl of linear chain or branched chain.用於製備3α-7α(β)-二-羥基-6α(β)-烷基-5β-膽烷酸(I)以及相關的中間産物3α-羥基-6α-烷基-7-酮基-5β-膽烷酸(Ⅷ)和3α-羥基-6α-烷基-7-酮基-5β-膽烷酸(Ⅸ)的方法,其中R是直鏈或支鏈的C1-C5烷基。