As I learned from Oracle Warehouse Builder (OWB), professional ETL tools would not be installed and configurated easily as MSSQL DTS. Therefore I should have to read installation and cofiguration docs before kicking off. But the bad habit that just running setup.exe before any reading hit me again.
The installation process succeed smoothly, except several dialogbox poped up to the man having nothing to do but to close them. Bingo! The man was me. I had no idea how to fill up those blank textbox, I could not decide if I should input a different password of my system password.
At least I made this software lay on my computer now. In MMC service window, I found two services named "Informatica" and "Informatica Repository" configurated in manual mode. Run them! This thought result in many errors in system log. What a stupid crap! I shouted, clicked and stared. It's time for reading works,thanks god there's not so many documents to read as cognos. 
In setup disk , two folders named manuals and help exist. files in thest folders are the same in content , they just various in file format as chm and pdf.
In my opinion, install.pdf is the first doc we should read carefully. Repository and Informatica server should be configurated first , then two services I metioned could be started.
-----To be continued.