Why the object will contains two shaders when import into unity?

I figure out that when my character is with rigging and animation, when import into unity, it will contains two shaders. One is i created in 3d software (blender) and another is created when i imported into unity. Can anyone explain why this will happen? Because it will distract my other shader when I import another file into unity scene.

1. character texture is the shader I created. 2.person2_character_texture_psd_005 is form when i import into unity.