The process of numerical value of iterative convolution algorithm is presented and a practical software is developed with turbo C 2.0. By means of computersimulation, we checked the reconstructed precision of this software and the relationship of reconstructed error with projective direction numbers and iterative numbers. The results show that this software has a good reconstructed precision as the projective sampling at equal interval over 180°, with the projective numbers of 6 and the iteration numbers of 8～10.