How can i set particle system resolution more 50?
Paticle system must be: emit - volume and grid
Please help!

The resolution has a hard limit of 250 (when the number is entered manually). If you really need more you could emit from vertices of subdivided plane (W in Edit Mode) and add an array modifier.

When you don't want to apply the array modifier you should tick the use modifier stack option in the particle settings:
