I'm staying next to tiantong rd railway station, how do I get to happy valley as easy as possible ?

Do you refer to Tiantong Road Subway Station?
If yes, take subway line 10 to Laoximen Station. Then transfer to line 8 to Lujiabang Station and line 9 to Sheshan Station, Exit 2. The duration is about 50 mins. And the ticket fare is CNY 6 per person.
After that, take free shuttle bus to arrive at the destination directly. It only takes around 5 mins.