Abstract: Aiming at the implementation of the collapsed cone convolution/superposition dose calculation algorithm, the primary fluence or TERMA (total energy released per unit mass) is calculated using a polyenergetic spectrum which is formed with Monte Carlo code. The Hoban's algorithm is introduced into beam hardening correction, and the Ahnesjo's inverse square law is introduced to correct the kernel tilting at the dose deposition site. The accuracy of the algorithm was verified by using AAPM phantom data test packet and clinically measured data. The results revealed that the measured values conform well to the calculated results, and the accuracy of dose calculated is within 3% or 3 mm. The clinical feasibility of the collapsed cone convolution/superposition dose algorithm is therefore illustrated.