Land, Taxation and Labour in the Qin State and Empire: Agriculture and State Mobilisation

Qin government drew grain, labour and soldiers from farming households. Reforms associated with Shang Yang in the fourth century BCE encouraged cultivation and military service; after unification in 221 BCE, county administration extended these demands across the conquered territories. Irrigation projects in Guanzhong, in present-day Shaanxi, and in Sichuan expanded the land that could be cultivated, while registers and accounts connected production with state obligations.

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Farming, land and military service

Qin rulers treated agricultural production, especially the supply of grain, as essential to state strength. The reforms associated with Shang Yang, introduced under Duke Xiao in the fourth century BCE, aimed to increase cultivation and direct more effort towards farming. Accounts of the reforms describe opening up fields and making land boundaries more regular.

The same reform tradition connected military achievement to rank and material reward. A soldier’s service could bring advancement, and accounts associate military merit with grants of land. This gave the state a way to reward service while making military participation part of a wider system of status and obligation. The emphasis on farming and fighting was not simply an economic programme: it was also a means of building the resources and manpower needed for warfare.

Land and household arrangements were linked. The Records of the Grand Historian attributes to Shang Yang a rule that households with two or more adult sons who had not separated paid double tax. The measure encouraged the division of large households and made obligations easier for the government to attach to identifiable units.

Households, taxes and official records

Registration made people and their duties more visible to local authorities. Qin households were organised in small groups whose members could be held responsible for reporting offences by one another. Such arrangements joined administration to surveillance: officials could use local knowledge to enforce rules, while people faced pressure to monitor neighbours as well as meet their own obligations. The system formed part of a wider effort to make law and taxation apply through recorded communities rather than relying only on powerful local families.

Taxes and contributions drew on agricultural production, and grain was important both as a resource for the state and as a means of provisioning officials and workers. Qin legal collections also include rules concerning fields, granaries, markets and labour service. They show that administration had to deal with more than the collection of a single levy: it also had to store, account for and move supplies.

One unusually informative group of records was found in Tomb 11 at Shuihudi in Hubei in 1975. The tomb belonged to Xi, a Qin official who had worked in county administration, and contained roughly 1,150 bamboo slips. They were buried around 217 BCE and include legal extracts, administrative guidance and records associated with official work.

The Shuihudi documents nevertheless reveal the practical demands of administration. Rules set out how officials should check accounts and manage supplies; other texts address fields, granaries and compulsory service. Manuals gave standards for workers’ output according to age, sex and physical capacity, and specified food rations for people of different legal and social statuses, including bondservants and children. Calculations involving fractions and proportions helped officials work out provisions and allocate resources.

Compulsory and penal labour

Households could owe compulsory labour service, often called corvée , in addition to supplying agricultural produce or other contributions. Such service gave the state a way to call on workers for construction and other tasks without treating every project as a fully paid undertaking.

Qin rules also set out how officials were accountable for the work they supervised. A Shuihudi statute prescribed that if a newly built wall collapsed within a year, the responsible officials could be penalised and the labourers required to rebuild it. The time spent rebuilding was not to count towards their service obligation. This provision linked the quality of construction to official responsibility while also imposing further work on labourers.

Qin officials distinguished penal labour from the service obligations of other subjects. Shuihudi texts distinguish legal statuses and include rules for managing labourers and their rations. Accounts of Shang Yang’s agrarian measures also associate convicts with work opening uncultivated land. Together, the evidence points to a system in which the state sought to classify workers, set expectations for their output and assign duties according to status.

Irrigation and the mobilisation of resources

Large water projects show how agricultural policy could require sustained planning and labour. In Sichuan, the Qin state began work on Dujiangyan around 256 BCE under the supervision of Li Bing, a regional official. Rather than blocking the Min River with a single dam, the system divided and redirected its flow. A diversion structure sent water towards channels serving the Chengdu Plain, while arrangements for excess water and sediment helped reduce flood risk and keep water moving through the irrigation network. The construction used stone-filled woven-bamboo baskets supported by wooden frames, and a channel was cut through Mount Yulei. Continuing maintenance and later alterations kept the irrigation system in use for subsequent generations.

Further north, the Zhengguo Canal began in 246 BCE in the Guanzhong region. According to Sima Qian’s account, the Han state sent the water engineer Zheng Guo to advise Qin to build a canal in the hope that the undertaking would consume its resources. When the plan was exposed, Qin nevertheless continued the work because the canal promised agricultural benefits. It carried water from the Jing River towards the Luo and helped irrigate low-lying, saline land. The river’s sediment could also be deposited on fields, improving land that had been difficult to cultivate. The project is generally described as taking about a decade to complete.

The canals joined agricultural expansion to military supply. Dujiangyan diverted water across the Chengdu Plain, while the Zhengguo Canal carried sediment-bearing water into fields in the Qin heartland. Their operation required control of channels and sediment as well as the labour of initial construction. The resulting cultivation enlarged the productive base from which the state drew grain and service.

For the wider setting, see Qin: The State and Empire That Unified China.