We present the first photometric results in J , H , and K _ { s } from 2MASS imaging of 10 classical globular clusters in the far outer regions of M31 .
Combined with the V and I photometric data from previous literature , we constructed the color-color diagram between J - K _ { s } and V - I .
By comparing the integrated photometric measurements with evolutionary models , we estimate the ages of these clusters .
The results showed that , all of these clusters are older than 3 \times 10 ^ { 9 } yrs , of which 4 are older than 10 Gyrs and the other 6 are in intermediate ages between 3 - 8 Gyrs .
The masses for these outer halo GCs are from 7.0 \times 10 ^ { 4 } M _ { \odot } to 1.02 \times 10 ^ { 6 } ~ { } M _ { \odot } .
We argued that , GC2 and GC3 , the ages , metallicities and the distance moduli of which are nearly the same , were accreted from the same satellite galaxy , if they did not form in situ .
The statistical results show that , ages and metallicities for these 10 M31 outer halo GCs do not vary with projected radial position , and the relationship between age and metallicity doest not exit .