In　this　paper　the　fast　design　and　optimization　of　low　energy　Moon　return　orbit　is　realized　with　STK/Astrogator.　With　the　analysis　of　the　dynamical　characteristics　of　the　low　energy　return　orbit,　the　return　orbit　is　divided　into　two　phases　and　a　bi-directional　integral　searching　method　is　proposed.　To　carry　out　the　searching　and　optimization　process,　the　STK/Astrogator　module　is　applied　to　build　the　simulation　environment.　The　calculation　result　shows　that　the　low　energy　Moon　return　orbit　can　be　designed　and　optimized　efficiently　and　automatically　with　the　STK/Astrogator　module　and　the　searching　method　proposed.　©　2019　IEEE.