How can I move the Sprite rightly?

I am a new in Unity, now I am making a simple 2D game, I create my player sprite as 32X32 pixels, but when I move the player from (0,0,0) to (0,32,0), It moves more than it's length. what can I make the sprite move just the length of it, by moving from(0,0,0) to (0,32,0)? Thanks very much.

I have used coco2d before, when I set the resolution of the game and the sprite, for example the game scene is 320x480, the sprite is 32x32, if i move the sprite for 32 pixels, it will exactly move 32 pixels. But in Unity it seems different.