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In this work, we present a search strategy for heavy charged Higgs boson atCompact Linear Collider (CLIC) as a future $e^+e^-$ collider. The signal ischarged Higgs boson pair production in two Higgs doublet model (2HDM) followedby $H^{\pm}\to W^{\pm}H$ and $H\to b\bar{b}$. Here, $H$ denotes the heavyCP-even neutral Higgs boson of the model. The collider center of mass energy ischosen to be $\sqrt{s}=1400$ GeV as the second stage of CLIC operation. In thiscase, $m_{H^+}<\sqrt{s}/2$ can be explored due to the pair production. It isshown that the signal of charged Higgs in the mass range 250 GeV $<m_{H^+}<$650 GeV in fully hadronic final state, containing four $b$-jets from neutralHiggs and four jets from $W$ bosons, can well be observed on top of the onlyremaining standard model background, i.e., $t\bar{t}$. Finally, a measure ofdata needed for discovery is expressed in terms of integrated luminosity for$5\sigma$ at each theoretical hypothesis.

Charged Higgs decay to $W^{\pm}H$ at a high energy lepton collider