The present invention relates to a crystalline form of tenofovir dipivoxil fumarate, a crystalline composition and a pharmaceutical composition comprising the crystalline form, and also to a process for preparing the same and the use for prophylaxis or treatment of a disease associated with a viral infection. The crystalline form has an X-ray powder diffraction pattern using Cu-Kα radiation, expressed in terms of lattice spacing “d” comprising peaks at about 18.4714 Å, 5.0350 Å, 4.6380 Å, 4.5347 Å, 4.3838 Å, 4.2874 Å and 3.6304 Å.フマル酸テノホビルジÅソプロキシルの結晶を公開した。更に、当該結晶を含む結晶組成物、薬物組成物、及びそれらの製造方法とウイルス感染関連疾病の治療・予防への応用に関する。当該結晶のCu-Kα放射を用いた粉末X線回折スペクトルにおいて、面間距離dで表すと、約18.4714Å、5.0350Å、4.6380Å、4.5347Å、4.3838Å、4.2874Å、3.6304Åに回折ピークがある。