Research　on　workload　measurement　of　the　air　traffic　controllers　has　attracted　much　attention　in　the　air　traffic　management　community　because　of　its　important　role　for　the　human　resource　planning,　running　efficiency,　and　especially　the　safety　of　the　air　traffic　system.　Recently,　traditional　ATM　has　encountered　some　challenging　problems,　such　as　the　substantial　increase　of　the　flights　number,　the　more　complex　airspace,　sensitivity　to　the　change　of　weather,　and　interaction　among　the　factors　mentioned　above.　Accordingly,　The　method,　ATCs＇　workload　measurement　method　based　on　air　traffic　complexity,　has　gradually　become　the　leading　one.　This　paper　reviews　the　process　of　research　on　ATCs＇　workload　measurement,　and　focuses　on　three　aspects　of　the　ATCs＇　workload　measurement　based　on　air　traffic　complexity,　including　typical　models,　research　methods　and　some　important　achievements.　It　also　points　out　some　existing　problems　which　remain　to　be　solved　and　gives　some　preliminary　ideas　for　future　research.