Calculating thermal parameters of all energy flows in the energy island system of our university is finished via dividing it into subsystems and drawing its subsystem chart. A thermal performance calculation and result analysis of the subsystems is performed. The unit prices of fuel exergy and product exergy are estimated and exergetic economical coefficients are calculated. The deficiencies in the energy island system are pointed out and improvement suggestions are put forward on the basis of thermoeconomic analysis of the results.