System of the present invention, which provides, uses pyrazolo [1,5-a] pyrimidine compound inhibit protein kinase method, it includes AKT, checkpoint kinase, aurora body kinases, Pim kinases and tyros kinase, and the method using such compound to treat, prevent, inhibit or improve one or more diseases relevant with protein kinase that the kinases, which is selected from,.本發明係提供使用吡唑并[1,5-a]嘧啶化合物抑制蛋白質激酶之方法,該激酶選自包括AKT、關卡激酶、極光體激酶、Pim激酶及酪胺酸激酶,及使用此種化合物以治療、預防、抑制或改善一或多種與蛋白質激酶有關聯疾病之方法。