The　site　occupy　behaviors　of　NbCr2-based　C15　Laves　phase　alloyed　with　M　(M　=　Ti,　V,　Mo　and　W)　and　Hf0.25V0.6NB0.15　C15　Laves　phases　at　finite　temperature　were　predicted　using　sublattice　model,　where　the　Gibbs　free　energies　at　finite　temperature　were　obtained　by　quasi-harmonic　approximation(QHA)　model.　The　predicted　results　were　compared　with　the　available　experimental　results　and　other　calculated　results.　The　prediction　was　improved　compared　with　early　thermodynamic　model,　where　the　enthalpies　of　formation　of　the　end-members　at　0　K　were　accounted　only.　For　NbCr2-based　C15　Laves　phases,　Nb　atom　prefers　to　occupy　8a　subattices,　Cr　atom　prefers　to　occupy　16d　subattices,　and　the　third　alloying　element　Ti　prefers　to　occupy　8a　subattices,　which　is　not　affected　by　the　chemical　composition　and　temperature,　on　the　contrary,　the　site　preferences　of　the　third　alloying　elements　Mo,　V　and　W　depend　sensitively　on　the　chemical　composition　and　temperature.　For　the　selected　ternary　Hf0.25V0.6Nb0.15　C15　phase　with　available　experimental　data,　the　site　fraction　of　Nb　element　occupying　the　8a　sublattices　decreases　slowly　with　the　increase　of　temperature,　the　calculated　site　occupying　configuration　at　1473　K　is　(Hf0.750Nb0.240V0.001)(8a)(Nb0.105V0.895)(16d),　which　is　close　to　the　available　experimental　result.