The　capacity　of　freeway　toll　station　directly　determines　the　freeway　capacity　and　generally　restricts　the　freeway　operational　status.　With　the　techniques　development　and　application　of　the　electronic　toll　collection　(ETC)　system,　a　large　number　of　mixed　toll　stations　with　manual　toll　collection　(MTC)　lanes　and　ETC　lanes　emerge.　The　capacity　of　mixed　toll　station　is　an　important　issue　for　toll　system　design.　This　paper　respectively　analyzed　the　traffic　flow　characteristics　of　MTC　lane　and　the　ETC　lane,　established　a　VISSIM　simulation　model　combined　with　field　survey　data　and　calibration　of　parameters.　As　a　result,　the　paper　obtained　the　reasonable　traffic　capacity　of　toll　plaza　in　cases　of　different　proportions　of　MTC　lanes　and　ETC　lanes.　Besides,　it　gave　the　best　ETC　traffic　ratio　of　total　traffic　when　the　overall　traffic　capacity　is　optimal.　In　addition,　the　study　also　estimated　the　capabilities　in　cases　of　ETC　traffic　flow　accounted　for　10%,　30%,　50%　under　a　certain　traffic　volume　input.　The　conclusions　provide　important　references　for　a　reasonable　traffic　capacity　determination　of　the　mixed　toll　stations　and　for　setting　new-open　ETC　lanes.