What's wrong in my circuit?

Hello~guys!I'm so happy to be here and I would like to express my grateful to you for spending time on reading my question!

I made a power switch by using MOS (I have forgot what brand it is,but I guess maybe it's this) , I added triode --S8050NPN to control it in the pre-circuit. The led is act as load in my circuit diagram. I don’t understand that why the voltage drop to 0.5V when the load current is bout 1A,and when 2A,it’s 1.2V? Is there any wrong in the circuit? Any idea? Can you?

Many appreciated!

PC:please look at the following picture:

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Where are you measuring the voltage drop?

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