PlayStation Development Network

I need to know that before download one for my ps1 Android emulator, so if anyone know anything about it, please tell me!

Generally no, you can't. Emulators don't typically let you boot PS-EXE's directly, yet alone the ECOFF format for Net Yaroze. You'll need to convert the Net Yaroze game to the PS-EXE format and then make a BIN/ISO image with a SYSTEM.CNF sheet so that it can boot on an emulator.