Abstract: Based on the theory of maneuverability differential equation of hydrodynamic form and K,T responsibility form(both linear and low degree nonlinear equation), the article took the track motion differential equation of trimaran gravity center as numerical simulation foundation, the maneuverability feature of trimaran including turning tracks, maneuverability curves and zigzag maneuverability curves were calculated by means of Matl ab simulation software, the calculation results were compared with that of monohull. The caculated results are reasonable and show that the characteristics of constant turning of the trimaran is less than that of monoh ull, and beeline stability respectively enhanced, follow-up steering and course changing quality improved.