Abstract: A linear 4cylinder gasoline engine crankshaft is researched. A 3D model using CATIA was established at first, and then a static analysis, modal analysis, and fatigue analysis were undertaken in HYPERMESH (HM) solver. And the stress, strain, natural frequency, fatigue life, and damage cycle were obtained. At last, via the data management by MATLAB, the optimal solution was obtained from the comparison of the parameters.