Hi,
I'm working in a graduate project pulse oximeter with arduino bluetooth. Can anybody help me or give any example or circuit?
thanks for all 
I think there will be very few people here with experience with pulse oximeters. I hope you have that part of the circuit already worked out for you. I use them and I have a pretty good idea of how they work but I couldn't draw the circuit.
Bluetooth is relatively easy with Arduino. Just pick a module and plug it in.
The circuit is pretty simple. You are reading two LED's and comparing the output. Try Google and see what you come up with first, then maybe ask for more specific help.
Googled "pulse oximeter arduino", almost 32k hits.....