the present invention discloses a novel soft capsule of butylphthalide and a process for preparing the same . the soft capsule of butylphthalide is composed of a capsule wall material and a drug - containing oil , wherein the drug - containing oil is essentially composed of butylphthalide and a vegetable oil as the diluent in a weight ratio of about 1 : 0 ˜ 10 . the capsule wall material is composed of a capsule wall matrix , a plasticizer and water in a weight ratio of 1 : 0 . 2 ˜ 0 . 4 : 0 . 8 ˜ 1 . 3 . the soft capsule of butylphthalide described in the present invention can mask the strong and special flavour of butylphthalide , and overcome the difficulties associated with formulating oily active ingredient into other oral formulation . the disintegration time of the soft capsule satisfies the requirement of pharmacopoeia of p . r . china .