在臺灣的城市空間中，由於公共設施普遍欠缺，街道遂成為最普遍的一種公共空間類型。然而近年來，街道的品質卻在急速地衰敗中，人們逐漸與街道疏遠而不自知。本文從存有論的觀點將此種趨勢界定為：街道作為一種空間類型，實面臨了「類型的危機」，而敏察到此一危機的空間專業者則必須突破「形態的困境」。進而，本文借用海德格對存有之空間性的思考以及諾伯舒茲對建築語言的討論，嘗試建立一種存有論的類型學與形態學思考，藉之詮釋西方專業者近一世紀來的努力，同時也突顯出臺灣街道營造的急迫性與努力方向。

　　　　　Streets became the most important types of public space in Taiwan, since most city lack of public facilities. However, the street livability has declined rapidly in recent years, and people were unconscious of alienating from the street. According to the perspective of ontological thinking, we developed two concepts:‘the typological crisis’ and ‘the morphological puzzle’ to analysis the situation in which the streets were. As an important type of city space, the development of street confronted the typological crisis and the designers who tried to deal with the problems was perplexed in the morphological puzzle. This paper takes its impetus from the ontological insights of Martin Heidegger on the spatiality of Being and Christian Norberg-Schulz's theory on the language of architecture, trying to redevelop typology and morphology ontologically. Base on the new concepts, we interpret the endeavor of the people who struggling against the death of the street, and then express the urgency and the way to remake the street place in cities of Taiwan.