The invention discloses amorphous selexipag, which is characterized in that the characteristic peak of the selexipag does not exist in an X-
ray powder diffraction spectrum. The invention discloses a preparation method of the amorphous selexipag, a
solid dispersoid of the amorphous selexipag and a
pharmaceutic adjuvant and a preparation method of the
solid dispersoid. The
solid dispersoid is prepared from the selexipag and the
pharmaceutic adjuvant; the weight ratio of the selexipag to the
pharmaceutic adjuvant is 1 to (0.1 to 100), wherein the selexipag is in an amorphous state; the X-
ray powder diffraction spectrum of the solid dispersoid has no characteristic peak of a
crystal of the selexipag after the background peak of the pharmaceutic
adjuvant is deducted. The solid dispersoid of the selexipag and the pharmaceutic
adjuvant, which is provided by the invention, is favorable in stability and
dispersity, is used for increasing the
dissolution rate of the selexipag, is used for more beneficially improving the
bioavailability of a medicinal preparation and the absorption of an
organism to a
medicine, and in an accelerated test condition, can be used for maintaining favorable
physical stability and
chemical stability. The preparation method of the
amorphous solid dispersoid, which is provided by the invention, is simple to operate, low in cost, good in
repeatability and easy to realize, and is suitable for industrialized production.