  The optimization of resistive anode for two dimensional imaging detectors
which consists of a series of high resistive square pads surrounding by low
resistive strips has been studied by both numerical simulations and
experimental tests. It has been found that to obtain good detector performance,
the resistance ratio of the pad to the strip should be larger than 5, the
nonuniformity of the pad surface resistivity had better be less than $20\%$, a
smaller pad width leads to a smaller spatial resolution and when the pad width
is $6mm$, the spatial resolution ($\sigma$) can reach about $105{\mu}m$. Based
on the study results, a 2-D GEM detector prototype with the optimized resistive
anode is constructed and a good imaging performance is achieved.
