Sentinel 3 archived data download

I needed Sentinel 3 data of 2016, but its not available in EUMETSAT. Can anyone suggest me how to get it.

You need to order the data. You can do it here:
https://www.eumetsat.int/website/home/Data/DataDelivery/EUMETSATDataCentre/index.html

thanks @marpet

I tried that, but it does not contain Sentinel 3 SLSTR data of 2016 (the search result is giving 0MB output)

Ah, 2016! Could be that there is no data.
L1 data is available since late 2016 and L2 is available even later, if I remeber correctly.
But to be sure, you can contact Eumetsat directly: https://www.eumetsat.int/website/home/ContactUs/index.html

Since May 2016 L1 data is shown available.
Will check with Eumetsat, thanks @marpet