By means of cooperation of CAE (computer aided engineering), design and experiment, based on dynamics, combustion, fluid and finite element, respectively establish engine dynamics, combustion, fluid and finite element model, proceed innovative research on engine thermal equilibrium, cooling heat dissipation and structural strength. Through the innovation research, create the JMC top-down design and analysis process, which makes JMC product development processes have significant innovation, Independently developed engine thermal equilibrium calculation program, can positively calculate engine thermal equilibrium and water jacket cooling. Engine thermal equilibrium and the structural analysis and evaluation ability is established, create a water jacket design optimization method, engine cylinder and water jacket heat transfer model, fluid, temperature field calculation model and the strength of the library is established, we form a specification, evaluation standard and guide top-down design on the engine thermal equilibrium, cooling heat dissipation and structural strength, which provide benchmark for subsequent engine design.