The present invention discloses the crystal form A of the compound (I) and the preparation method thereof. The invention also discloses the application of the crystalline form A as the PDE2 or TNF-α inhibitor.本發明公開了化合物(Ⅰ)的晶型A及其製備方法,本發明還公開了晶型A作為PDE2或TNF-α抑制劑的應用。