For a LED source with a continuous spectrum, if we just consider a specific wavelength such as 570nm, how can I understand its spatial coherence or temporal coherrence？Or another saying for this wavelength light ,does it has any difference with the laser in 570nm.
The wavelength of a light source is independent of its coherent properties, and simply defines the colour of the light/energy of the photons.
Coherence describes how light propagates, and both spatial and temporal coherence can be defined independently.
https://en.wikipedia.org/wiki/Coherence_(physics)
The coherent properties of a light source are typically defined by how the light is generated, and in lasers, it is the stimulated emission that means that the emitted light is highly coherent.
That said, whether coherence is important very much depends upon your application. Typically if you are interfering light, then you need high coherence.
Temporal coherence one can relate to the width of the emitting spectrum line. For example gas-lasers have very thin spectrum of emitted light in comparison with semiconductor lasers due to longer coherence time of gas lasers.
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