The　valence　electron　structures　of　Al3Er　and　Al-3(ZrxEr1-x)　phases　resulted　from　minor　elements　Er　and　Zr　addition　to　Al　alloys　were　calculated　according　to　the　empirical　electron　theory　in　solid　and　molecule　(EET).　Effects　of　Zr　contents　on　the　valence　electron　structure　parameters　of　Al-3(ZrxEr1-x)　phases　were　discussed.　The　calculation　results　show　that　with　the　increase　of　Zr　atom　content,　both　the　covalent　electron　pairs　n(a)　on　the　strongest　bond　for　strength　properties　characterization　and　the　phase　structure　forming　factor　S　decrease,　which　indicates　Al3Er　phases　firstly　precipitate　during　the　solidification　process　and　Al3Er　and　Al-3(ZrxEr1-x)　also　precipitate　during　the　subsequent　heat　treatment;　whereas,　Zr　addition　has　few　influence　on　the　strength　of　the　alloys.　The　density　of　crystal　lattice　electron　rho　for　plastic　properties　characterization　increases　first　and　then　decreases,　revealing　that　Zr　addition　can　obviously　improve　the　plastic　properties　of　the　alloys.