  In this work, we employ the $\bar{\partial}$-steepest descent method to
investigate the Cauchy problem of the Wadati-Konno-Ichikawa (WKI) equation with
initial conditions in weighted Sobolev space $\mathcal{H}(\mathbb{R})$. The
long time asymptotic behavior of the solution $q(x,t)$ is derived in a fixed
space-time cone $S(y_{1},y_{2},v_{1},v_{2})=\{(y,t)\in\mathbb{R}^{2}:
y=y_{0}+vt, ~y_{0}\in[y_{1},y_{2}], ~v\in[v_{1},v_{2}]\}$. Based on the
resulting asymptotic behavior, we prove the soliton resolution conjecture of
the WKI equation which includes the soliton term confirmed by
$N(\mathcal{I})$-soliton on discrete spectrum and the $t^{-\frac{1}{2}}$ order
term on continuous spectrum with residual error up to $O(t^{-\frac{3}{4}})$.
