A large-scale ab initio molecular dynamics simulation of the insertion of nitrogen atom into C-60 is carried out by using the all-electron mixed-basis approach. In this approach, a one-electron wave function is expressed by superposing truncated numerical atomic orbitals and plane waves. The LDA (local density approximation) is used to calculate electronic states. 4169 plane wave, having a cut-off energy of 7Ry (1Ry=13.6eV), and 1s, 2s and 2p atomic orbitals for carbon and nitrogen atoms are used in this calculation. Consequently, we found that with proper incident kinetic energy around 80eV (1 eV = 1.602 x 10(-19) J) the nitrogen-encapsulated C-60 N@C-60 is finally realized by a collision of a nitrogen atom against C-60.