The present invention relates to a novel crystalline form of a compound of formula (I), a process for its preparation and its use. The novel crystal form provided by the present invention has good stability, low hygroscopicity, and remarkable purification effect. The novel crystalline form of the compound of formula (I) provided in the present invention can be used for the production of an anti-heart failure drug. [Chemical 1] [Selection] Figure 1本発明は式(I)の化合物の新規結晶形、その製造方法及び用途に関する。本発明で提供する新規結晶形は安定性が良好で、吸湿性が低く、精製効果が顕著である。本発明で提供する式(I)の化合物の新規結晶形は、抗心不全薬の製造への使用が可能である。【化1】【選択図】図1