Globular clusters (GCs) are the oldest stellar system in the Galaxy, in which the millisecond pulsars are widely believed to be the only steady {gamma}-ray emitters. So far 9 {gamma}-ray GCs have been identified and a few candidates such as 2MS-GC01
and IC 1257 have been suggested. In this work, after analyzing the publicly-available Fermi-LAT data we confirm the significant {gamma}-ray emission from 2MS-GC01 and IC 1257 and report the discovery for {gamma}-ray emission from NGC 5904 and NGC 6656 within their tidal radii. Also a strong evidence of significant {gamma}-ray emission is found from FSR 1735. From the observed {gamma}-ray luminosities, the numbers of MSPs that are expected to be present in these GCs are estimated.
