what is the direction of extrusion in extrude pls see the attachment image
This is used when you choose option like up to surface, up to vertex, etc. for extrude type which is blind right now in your picture. Once you select the other options then you need to pick the appropriate entity to complete the extrude command.
Extrusion is normally perpendicular to the sketch, but if you want extrusion other than perpendicular to the sketch (or using 3D sketch) you can specify the direction by selecting other geometry.
2014 SOLIDWORKS Help - Example: Specifying the Direction of Extrusion
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