The　local　coordination　structures　around　the　doping　Yb　2+　ions　in　sodium　and　potassium　halides　were　calculated　by　using　the　first-principles　supercell　model.　Both　the　cases　with　and　without　the　charge　compensation　vacancy　in　the　local　environment　of　the　doping　Yb　2+　were　calculated　to　study　the　effect　of　the　doping　on　the　local　coordination　structures　of　Yb　2+.　Using　the　calculated　local　structures,　we　obtained　the　crystal-field　parameters　for　the　Yb　2+　ions　doped　in　sodium　and　potassium　halides　by　a　method　based　on　the　combination　of　the　quantum-chemical　calculations　and　the　effective　Hamiltonian　method.　The　calculated　crystal-field　parameters　were　analyzed　and　compared　with　the　fitted　results.　©　2012　Chinese　Physical　Society　and　IOP　Publishing　Ltd.