The creation of “trapezoidal” model has become a new way to improve the efficiency of public cultural service in Qingdao.It is also an important carrier for the effective connection of the main body and service object of public cultural service.It has promoted the construction and promotion of a number of cultural brands，extended the mass cultural activities from the traditional to innovative ways，made breakthrough in training from the shallow level to the deep level，and lifted theoretical research and quality creation to a higher level，thus opening up an effective new service model for public cultural service .