The“life style”of urban park is changeable.As a general tourist and an ordinary audience,they can completely revel in the plot representation compiled and directed by designers.As a backstage director,the designer has to think about the structural logic of park space.Based on the architectural typology method of Aldo Rossi,the elements of urban park can be reduced to four kinds of substrates:forest belt,lawn,hard substrate(including garden architecture)and water body,regardless of specifi c form factors of surface layer.In response to the changes of external environment conditions,the nesting relationship of four kinds of substrate is restored topologically,and three types of schema are summarized:introvert type,neutral type and extravert type.