can not see specular effect at some angle

This is the way specular works.

To make your to have environment more specularity, you need to use reflections. I already said it to you in other question )

Why? Reflection environment supported on mobile

Ok. In this case you can use custom shading model. But I think you need it to be lit and use lightmaps, yes?

You can use some screen aligned specular shape in emissive.

Try to start with something like this.

Hi,
On the mobile platform,only in the direction of the sun can see the specular effect.Is there any way to make the direction of the sun into a camera perspective?Thanks.

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Thank you for your answer,
but this is the operation of the mobile platform, I can not do reflective processing of the material。
Sad :(

The effect of Specular needs to follow my camera,this material is used on the terrain,
taking into account performance issues,I can not use reflections.