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I am rendering a image in cycles.The question is how to blur background in blender cycles?

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You can use dept of field to blur the background. It is located in the camera properties panel. enter image description here

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There are many ways of doing this, here is how I would do it.

First, go to the render layers tab of the properties view and enable an environment pass under the passes rollout.
enter image description here

Then make sure you have checked transparent under render properties > film rollout.
enter image description here

Then you can blur just the environment pass in the compositor and mix it into the render using a mix node based on the alpha.
enter image description here

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