空城計，是壹種心理戰術。在己方無力守城的情況下，故意向敵人暴露城內空虛，讓敵人產生對方有所準備的假象而不敢貿然進攻，從而使自己度過難關。
漢:《三國誌.裴松之註引》：亮屯於陽平，遣魏延諸軍並兵東下，亮惟留萬人守城。晉宣帝率二十萬眾拒亮，而與延軍錯道，徑至前，當亮六十裏所，偵候白宣帝說亮在城中兵少力弱。亮亦知宣帝垂至，已與相逼，欲前赴延軍，相去又遠，回跡反追，勢不相及，將士失色，莫知其計。亮意氣自若，敕軍中皆臥旗息鼓，不得妄出庵幔，又令大開四城門，埽地卻灑。宣帝常謂亮持重，而猥見勢弱，疑其有伏兵，於是引軍北趣山。明日食時，亮謂參佐拊手大笑曰：“司馬懿必謂吾怯，將有強伏，循山走矣。”候邏還白，如亮所言。宣帝後知，深以為恨。
英:《Three Kingdoms ambition.The Pei is loose to note to lead 》:The bright Tun is even at the sun and send a Wei to postpone a various soldier to combine a soldier under the east, bright however stay myriad people to defend city.The Jin declares an emperor rate 200,000 many refuse bright, but with postpone the soldier wrong way, path before go to, be bright 60 inside, the Zhen wait white Xuan Di4 Shuo is bright the soldier be little in the city the dint be weak.Bright also know that Xuan Di4 hang to, already with mutually force, leave for to postpone a soldier before the desire, mutually go and far return to vestige anti- make track for, power not and mutually and, the officers and men disgrace and the Mo knows that it account.The bright idea spirit is self-composed, all lie ensign interest drum in the Chi soldier, can not wildly drapery, and then make to open door in Szu-cheng greatly, but the Sao ground spread.Declare the emperor often calls bright hold heavy, but the Wei see certainly weak, Yi it has ambush and the Wu leads the soldier north interesting mountain.When tomorrow eat, it was bright to call three the Zuo Fu hand cachinnation Yue:"Take charge of Ma3 Yi4 to necessarily call my Qie, will there is strong Fu, follow mountain to walk Yi."Wait the Luo returns white, like bright words.After declare an emperor know, deeply think to hate.
《三國誌.
《Three Kingdoms ambition.
裴松之註引》：
The Pei is loose to note to lead 》:
亮屯於陽平，遣魏延諸軍並兵東下，亮惟留萬人守城。
The bright Tun is even at the sun and send a Wei to postpone a various soldier to combine a soldier under the east, bright however stay myriad people to defend city.
晉宣帝率二十萬眾拒亮，而與延軍錯道，徑至前，當亮六十裏所，偵候白宣帝說亮在城中兵少力弱。
The Jin declares an emperor rate 200,000 many refuse bright, but with postpone the soldier wrong way, path before go to, be bright 60 inside, the Zhen wait white Xuan Di4 Shuo is bright the soldier be little in the city the dint be weak.
亮亦知宣帝垂至，已與相逼，欲前赴延軍，相去又遠，回跡反追，勢不相及，將士失色，莫知其計。
Bright also know that Xuan Di4 hang to, already with mutually force, leave for to postpone a soldier before the desire, mutually go and far return to vestige anti- make track for, power not and mutually and, the officers and men disgrace and the Mo knows that it account.
亮意氣自若，敕軍中皆臥旗息鼓，不得妄出庵幔，又令大開四城門，埽地卻灑。
The bright idea spirit is self-composed, all lie ensign interest drum in the Chi soldier, can not wildly 庵 drapery, and then make to open door in Szu-cheng greatly, but the Sao ground spread.
宣帝常謂亮持重，而猥見勢弱，疑其有伏兵，於是引軍北趣山。
Declare the emperor often calls bright hold heavy, but the Wei see certainly weak, Yi it has ambush and the Wu leads the soldier north interesting mountain.
明日食時，亮謂參佐拊手大笑曰：
When tomorrow eat, it was bright to call three the Zuo Fu hand cachinnation Yue:
“司馬懿必謂吾怯，將有強伏，循山走矣。
"Take charge of Ma3 Yi4 to necessarily call my Qie, will there is strong Fu, follow mountain to walk Yi.
”候邏還白，如亮所言。
"Wait the Luo returns white, like bright words.
宣帝後知，深以為恨。
After declare an emperor know, deeply think to hate.