This paper presents a new conception:Time is a new dimensionality in space.That means time is space.To be detailed

time is space that is constructing rather than space that has been constructed.That is to say

realistic space is consisted of time

while time is the new special dimensionality that is constructing.The process from time to space is a consuming one from low entropy to high entropy.In this way

the time continuity is condensed to space extension.