The　polymer　electrolyte　based　solid-state　lithium　metal　batteries　are　the　promising　candidate　for　the　high-energy　electrochemical　energy　storage　with　high　safety　and　stability.　Moreover,　the　intrinsic　properties　of　polymer　electrolytes　and　interface　contact　between　electrolyte　and　electrodes　have　played　critical　roles　for　determining　the　comprehensive　performances　of　solid-state　lithium　metal　batteries.　In　this　review,　the　development　of　polymer　electrolytes　with　the　design　strategies　by　functional　units　adjustments　are　firstly　discussed.　Then　the　interfaces　between　polymer　electrolyte　and　cathode/anode,　including　the　interface　issues,　remedy　strategies　for　stabilizing　the　interface　contact　and　reducing　resistances,　and　the　in-situ　polymerization　method　for　enhancing　the　compatibilities　and　assembling　the　batteries　with　favorable　performances,　have　been　introduced.　Lastly,　the　perspectives　on　developing　polymer　electrolytes　by　functional　units　adjustment,　and　improving　interface　contact　and　stability　by　effective　strategies　for　solid-state　lithium　metal　batteries　have　been　provided.