Abstract: Based on simulated annealing arithmetic， a method of automatically matching point kernel convolution/superposition dose calculation model was suggested. A global optimal solution can be reached with simulated annealing arithmetic， but it is uncontrollable because of its randomicity. To solve this problem， a method of limiting the energy spectrum sample space was used， which improved the optimization efficiency and stability. BeamNRC software was also used to generate a good initial energy spectrum in order to reduce iteration times. From results of the test on the machine data， it was concluded that the method mentioned in this article could meet the clinical requirements since the optimization time was around one point six hour. Having good initial energy spectrum， the result was better than the international similar products. The dependence degree of the operator technique and the maintenance cost could be reduced， and the product competitiveness could be improved with this method.

Key words: simulated annealing, point kernel convolution/superposition, dose calculation, automatically matching