how can i make a homemade fire alarm?

i wan2 make a homemade fire alarm dut dont know to.

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Maybe spelling your keywords properly in google would help.
I'm sure there's a way to make a homemade fire alarm system, but I'm not sure that you would want one. I know that I wouldn't trust something I make to save my life.
What kind ? An automatic one, or one you hit with a hammer ?

well, i want to make a thing u pull to make a alarm go off.
just not to loud to call the fire-department
Basically what you need are three things.
a power supply (usually 12 V, try an AC adaptor)
a Pull station (the thing you pull to set off the alarm. you can use a switch) Check eBay, I bought a FireLite BG12 for $15 new! I also have some older ones if you want)
a signaling appliance (the actual alarm) you can get a 'horn' or 'horn/strobe' unit. I recommend the ones made by Wheelock. Those can also be found for cheap. There's also stand alone strobe units. I have a lot of extra ones that are new or like new, so let me know if you're interested in buying some. I can arrange payment via Paypal for security.