The　optimized　structures,　electronic　properties　and　bonding　characteristics　of　the　hexagonal　C14　Laves　phase　XCr2　(X=Ti,　Zr,　Nb,　Hf　and　Ta)　have　been　investigated　using　first-principles　calculations.　Our　results　reveal　that　the　equilibrium　formation　enthalpies　are　not　depends　entirely　on　the　atomic　numbers.　The　total　and　the　partial　density　of　states　and　valence　charge　densities　of　Laves　phases　are　also　calculated　and　applied　to　reveal　the　nature　of　the　bonding　character　in　consideration　of　the　different　atomic　numbers.