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Compared with traditional thermal electron sources, field‐emission electron sources have many advantages, such as high brightness, coherence, and suitability for miniaturization. However, their instability has prevented their widespread use. Stable field emission from a hybrid structure with a tungsten diselenide (WSe2) monolayer on zinc oxide (ZnO) nanowires is achieved by geometrically modulating the WSe2 curvature. It is found that an emitter with a lower WSe2 curvature induces hotter electrons during field emission, which results in a low turn‐on field and high stability. Considering the similarity of 2D materials, a general approach for obtaining a highly stable field emitter using a 2D–1D hybrid structure is provided. [ABSTRACT FROM AUTHOR]