Stop　spacing　is　key　design　variable　in　urban　public　transport　networks.　It　determines　both　the　travel　time　for　the　passengers　and　the　costs　for　the　operator.　Stop　spacing　influences　the　average　speed　of　a　public　transport　vehicle,　the　access　distance　and　thus　the　access　time.　In　order　to　offer　a　certain　theoretic　basis　to　the　design　and　decision　of　public　transport　network　and　its　stop　spacing,　the　paper　provides　optimization　method　of　public　transport　in　three　aspects:　Passengers,　operators　and　authorities.　Multi-object　optimized　models　are　presented　to　minimize　weighted　travel　time　of　passengers,　maximize　the　cost　effectiveness　of　operators　and　maximize　social　welfare.