The dialctical unity of "tchnology" and“art" is particularly important in the era of all media and the development of design enabling society. Contemporary design, a an explicit expression, ollects“technology" and "art", so“good" design must be the final presentation of the collision and perfect integration of“technology" and "ant". Therefore, the opposite of the two is the future development trend of design. At the same time, this trend has changed the inherent concept and way of design criticism and guided it to develop towards diversification. Based on the current excellent design cascs at home and abroad, the work aims to discuss the changes and trends of design development under the background of all media era, comb the relationship between the mutual promotion and common development of“technology" and “art", and deeply consider the infuence of the dynamice development of design in the“post epidemic" era on the diversified ways of contemporary design criticism.