《汉书·传·公孙刘田王杨蔡陈郑传》
杨惲担任中郎将，免除 山郎 的旧例，把郎官府衙全年的开支计划移交大司农，由大司农供给财务费用。
惲为中郎将，罢山郎，移长度大司农，以给财用。
When Yang Yun became a Zhonglang General, he exempted the old rule of "Mountain Lang" and handed over the annual budget for the administrative office of the Lang officials to the Grand Minister of Agriculture, who would then provide the financial expenses.