The present invention relates to a new polymorph crystal form of 3-(N-methyl-N-pentyl) amino-1-hydroxypropane-11-diphosphonic acid monosodium salt monohydrate (Ibandronate) with the following formula本發明係關於一種具有下式之3-(N-甲基-N-戊基)胺基-1-羥基丙烷-1,1-二膦酸一鈉鹽單水合物(伊班膦酸鹽)之新的多晶型物晶體形式:;式1;;及其製備方法。