I have cisco 2610 router but it has only one ethernet interface.
I want to add more Fastethernet interface on it.
But i don't know which network module is for that router.
can anyone please guide me
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There are no FastEthernet WICs (only HWICs), and none of the 10/100 network modules are officially supported for the 2600 series (except the 2691 in some cases). While at least one person has reported getting an NM-1FE-TX working in a 2620, the bigger problem you have is that the 2610 has limited throughput capacity, and the benefit you'll see with a 100 Mbps interface over 10 Mbps will depend greatly on your configuration and the type of traffic you push through it. You may be better off looking for an NM-1E or NM-4E 10 Mbps card, both of which are definitely supported on the 2600 series.
Also, bear in mind that this platform and these modules are well past EOL, so you'll likely need to source parts from the used/refurb market.