The first aim of this campaign was to make more accessible the trade routes to Central Asia, which up to now had led through the difficult mountain passes of Szechwan; to this end treaties of alliance had been concluded with the states in Kansu against the "Later Ch'in".

The caravan routes passed through western Shensi and Kansu to eastern Turkestan, but at that time the Hsiung-nu dominated the approaches to Turkestan and were in a position to divert the trade to themselves or cut it off.

A leading part in the extermination of the reformers was played by troops from Kansu under the command of a Mohammedan, Tung Fu-hsiang.