I ABSTRACT As a special financial industry, the insurance company need to do some sensible investment with their reserve, prepare to deal with large future claims and ensure the company could develop healthily and stably. Now the insurer uses so-called constant mix strategy to invest its reserve, at each instant of time an initially fixed fraction θ of the weath is invested in the risky asset and another 1−θ into the riskless asset. Under this mix strategy, the insurer cares the finite-time ruin probability. An exponential Lévy process-based investment model with heavy-tailed claims can be a good description of the insurer’s investment with a constant mix investment strategy. In this paper, we will introduce the properties of Lévy process and heavy-tailed. Use the model, and then based on the earnings model of insurance company, we give the definition of finite time ruin probability, and introduce three investment model with a mix strategy, and give the expressions of ψ θ (α ) , when ψ θ ()α < 0 the insurance risk dominates financial risk, and when ψ θ (α )>