Objective:　To　investigate　the　usefulness　of　HC　visual　laryngoscope　designed　for　unskilled　junior　emergency　resident　doctors　in　respect　of　increasing　the　efficiency　and　success　rate　of　emergency　tracheal　intubation.　Methods:　A　total　of　80　patients　needed　the　emergency　tracheal　intubation　were　at　first　divided　into　two　groups　randomly　(random　number).　Patients　in　group　A　were　operated　by　junior　emergency　resident　doctors　and　patients　in　group　B　were　operated　by　well　experienced　attending　doctors.　Then,　the　two　groups　of　patients　above　were　divided　into　two　groups　randomly　(random　number).　Patients　in　group　N　were　operated　with　conventional　laryngoscope　and　patients　in　group　HC　were　managed　with　HC　visual　laryngoscope.　Then　comparisons　of　the　success　rate　of　glottis　exposure,　the　one-time　success　rate　of　tracheal　intubation,　the　success　rate　of　tracheal　intubation,　the　complications,　the　number　of　attempt　in　successful　intubation　cases　and　the　operative　time　consumed　for　successful　intubation　cases　among　the　groups　were　done.　Results:　(1)　The　success　rate　of　glottis　exposure,　the　one-time　success　rate　and　the　success　rate　of　tracheal　intubation　in　group　A-HC　were　90%,　70%　and　90%,　respectively　which　were　significantly　higher　than　those　(50%,　20%　and　45%)　in　group　A-N　(P　＜0.　05).　The　rate　of　complication,　the　number　of　attempt　and　operative　time　consumed　for　intubation　cases　in　group　A-HC　were　respectively　15%,　(1.　28　±　0.43)　and　(31.44　±5.　06)　s,　which　were　significantly　less　than　those　[45%,　(1.89　±0.79)　and　(45.　89　±4.　99)　s　in　group　A-N　(P　＜0.　05).　(2)　The　success　rate　of　glottis　exposure,　the　one-time　success　rate　and　the　success　rate　of　tracheal　intubation　in　group　B-N　were　80%,　65%　and　80%,　respectively　which　were　significantly　higher　than　those　(50%,　20%　and　45%)　in　group　A-N　(P　＜　0.　05).　The　rate　of　complication,　the　number　of　attempt　and　operative　time　consumed　for　successful　intubation　cases　in　group　B-N　were　15%,　(1.　25　±0.　41)　and　(39.　31　±4.　23)　s,　respectively　which　were　significantly　less　than　those　[45%,　(1.　89　±0.　79)　and　(45.　89　±4.　99)　s]　in　group　A-N　(P　＜0.　05).　(3)　There　were　no　significant　statistical　differences　in　above　results　between　group　A-HC　and　group　B-HC　(P　＞　0.　05).　Conclusions:　HC　visual　laryngoscope　used　by　unskilled　junior　emergency　resident　doctors　for　emergency　tracheal　intubation,　could　increase　success　rate　of　glottis　exposure,　decrease　the　number　of　attempt　of　intubation,　decrease　rate　of　complication,　shorten　operative　time　required　for　intubation　thus　improving　efficiency　and　success　rate　of　emergency　tracheal　intubation,　and　maybe　narrow　the　skill　gap　between　unskilled　junior　resident　doctors　and　well　experienced　attending　doctors　in　respect　of　emergency　tracheal　intubation.