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Dimensional evolution between one-($1D$) and two-dimensional ($2D$) topological phases is investigated systematically.The crossover from a $2D$ topological insulator to its $1D$ limit shows oscillating behavior between a $1D$ ordinary insulator and a $1D$ topological insulator.By constructing a $2D$ topological system from a $1D$ topological insulator, we show the existence of weak topological phases in $2D$ time-reversal invariant band insulators.The phase is realized in anisotropic systems.Its topological invariant $Z_{2}=0$ and the edge states only appear along specific boundaries.It can be interpreted as arranged $1D$ topological phases, and have symmetry-protecting nature as the corresponding $1D$ topological phase.Though it can be destroyed by disorder, robust edge states can exist under specific conditions.These results provide further understanding on $2D$ time-reversal invariant insulators and the topological phases in different dimensions, and can be realized experimentally.