The invention relates to a dry powder formulation for inhalation comprising a combination of an anti-cholinergic, a long-acting beta2-adrenoceptor agonist, and a corticosteroid, and to a process for preparation thereof.本發明係有關於一種吸入用之乾粉配方包含抗膽鹼劑、長效β2-腎上腺素受體促效劑、及皮質類固醇的組合,及有關於其製備方法。