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Coronary artery systems are a kind of complex biological systems.Their chaotic phenomena can lead to serious health problems and illness development.From the perspective of engineering,this paper investigates the chaos suppression problem.At first,nonlinear dynamics of coronary artery systems are presented.To suppress the chaotic phenomena,the method of derivative-integral terminal sliding mode control is adopted.Since coronary artery systems suffer from uncertainties,the technique of disturbance observer is taken into consideration.The stability of such a control system that integrates the derivative-integral terminal sliding mode controller and the disturbance observer is proven in the sense of Lyapunov.To verify the feasibility and effectiveness of the proposed strategy,simulation results are illustrated in comparison with a benchmark.