Difference 1 different species: Oats is an annual herb of the family Gramineae, wheat is a millet of the family Gramineae and genus Wheat.

Difference 2 different plants: oat stems erect and smooth, ligule large, no spikes, leaves flattened, axis erect or pendulous, spikelet stems curved and pendulous; wheat stems erect, tufted, leaf sheaths sparse, wrapped, ligule membranous, leaves long lanceolate.

Difference 3 flowers are different: oats flowers for panicle, inflorescence terminal, spikelet contains 2 ~ several flowers, most longer than 2 cm; wheat flowers are spikelike, spikelet with 3-9 small flowers, inflorescence length of 5-10 cm.

Difference 4 different fruits: oats have longitudinal grooves on the ventral surface, sparse tomentum, fruit powder between gray and beige; wheat fruit oblate or ellipsoidal, yellowish-brown, slightly pointed or obtuse at both ends, fruit powder white.

Difference 5 status is different: oats is a miscellaneous grain, one of the world's top ten health food, indispensable dry food in poor areas; wheat is one of the three major grains, one of the staple food of mankind, and one of China's most important rations.