The　rapid　development　of　the　information-exchange　networks　accelerates　the　consumption　of　resources　and　energy.　For　future　green　communications,　the　integration　of　many　conventional　communication　systems　is　necessary,　where　the　optimization　of　the　component　elements　in　the　communication　integrated　systems　realizes　energy-savings.　In　this　paper,　integrated　physical-layer　and　cross-layer　communication　coding　systems　are　reviewed,　where　the　physical-layer　design　focuses　on　coded　modulation　and　the　cross-layer　design　focuses　on　the　joint　source-channel　coding　scheme　and　joint　channel　physical-layer　network　coding　scheme.　The　characteristics　of　the　integrated　systems　are　analyzed　using　the　extrinsic　information　transfer　algorithm.　Taking　the　re-design　of　the　protograph　low-density　parity-check　codes　as　an　example,　different　design　principles　for　various　integrated　systems　are　discussed,　showing　the　necessity　and　significance　of　optimization　for　component　elements　in　integrated　coding　systems　for　green　communications.