The edges are sharp making the sphere not smooth. I have applied the sub-surf modifier, but it does not appear to help smoothing the sphere. 
I have attached my final render model.
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$\begingroup$ What is your problem? I see that the edges could use a bit of bevel, but what else? $\endgroup$– Jake DubeCommented Nov 22, 2016 at 15:15
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$\begingroup$ Can you add you blend file? (blend-exchange.giantcowfilms.com) $\endgroup$– floatCommented Nov 22, 2016 at 15:15
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$\begingroup$ You might want to include some screenshots showing your settings. This will help you get a faster response/solution. $\endgroup$– DelagoneCommented Nov 22, 2016 at 15:17
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$\begingroup$ Have you smoothed the mesh? (open up the Tool Shelf with T, then Tools-Edit panel-Shading:Smooth). How many Subsurf Modifier subdivisions you have? $\endgroup$– Paul GonetCommented Nov 22, 2016 at 15:38
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$\begingroup$ blend file attach $\endgroup$– atekCommented Nov 22, 2016 at 15:45
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2 Answers
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While the answer given by 10 Replies is correct - you did not have sub-surf modifiers added to the objects - I think there is another problem. The edges of the front red spherical shape, and the back rear dark shape have slight deviations. The particular angle you have chosen for your composition shows very slightly the edge of the back object.
If you have a look at the edge in Edit Mode - you will see it is not what can be considered a clean topographical mesh. Presumably by either Boolean or the knife tool you have an edge that has triangles and this is where the sub-surf will try, but not necessarily solve the problem.
You could probably get away with just adjusting the angle a bit. If you do want to fix the edge, ideally you would want an edge loop where you might add a slight bevel to soften...
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Turn up the Subsurf Modifiers
If the render is too sharp, turn the render subdivisions up to 3 or 4. If the preview is too sharp, turn up the view subdivisions. Typicaly it is best practice to have lower preview subdivisions than render subdivisions.
Make sure that the object you want to modify is selected when you use the sub surf modifier.
For those of you who need more help, please watch the following gif that consists of 3 mouse clicks:
Also, make sure you do this with every single part of your model, otherwise some parts might have more creased edges.
answered Nov 22, 2016 at 15:44
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$\begingroup$ i have attach my blend file plz go through its not working $\endgroup$– atekCommented Nov 22, 2016 at 15:47
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$\begingroup$ @atek Make sure that the object you want to modify is selected when you use the sub surf modifier. $\endgroup$ Commented Nov 22, 2016 at 15:50
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$\begingroup$ Plz tell me if the sub surf modifier or other modifier works from my side it did not work for me $\endgroup$– atekCommented Nov 22, 2016 at 16:09
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$\begingroup$ @atek I can't actually test it right now because I'm in the middle of an intense render, but in a few hours I should be able to do it. $\endgroup$ Commented Nov 22, 2016 at 16:10
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$\begingroup$ ok take ur time and plz tell me what it can work and which modifier is help for me to make the model smoother $\endgroup$– atekCommented Nov 22, 2016 at 16:12