The　second　harmonic　generation　(SHG)　coefficients　of　nonlinear　optical　crystals　play　an　important　role　in　measuring　the　nonlinear　optical　properties　of　materials,　but　it　is　time-consuming　to　get　the　SHG　coefficients　by　the　theoretical　calculation.　In　this　paper,　we　proposed　two　sorts　of　parallel　computing　schemes　for　the　SHG　coefficients　based　on　Message　Passing　Interface　(MPI).　If　the　amount　of　nodes　is　small,　we　will　choose　the　the　master　slave　model　and　statically　allocated　tasks;　on　the　other　hand,　we　will　select　the　work　pool　mode　for　large　amount　of　nodes,　which　can　prevent　the　main　node　to　suffer　bottlenecks　and　get　a　sufficient　load　balancing.　The　experimental　results　show　that　with　the　master　slave　model,　the　efficiency　reaches　to　98%　when　using　4　nodes　and　declines　with　the　nodes　becoming　large;　while　the　work　pool　mode　reaches　the　stable　efficiency　of　85%　in　the　parallel　computing　with　more　than　24　processors.