some questions about high precesion constant current source

hi,everybody. I have some questions about hight precesion constant
current source.My goal is 1uA whose error is blow 0.01%. In my circuit
I used a op-amp,p-mosfet and 5V voltage reference. But the result is so
bad,the error is almost 1%. Could somebody give me some hints? Thanks
very much. eehinjor

.

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