which is the fastest way to reach International Airport Pudong from Hangzhou via train?

If by train, take high-speed train at East Hangzhou Railway Station, and get off at Hongqiao Railway Station. It takes around 1.5 hours on the way. After arrival, take airport shuttle bus line 1 to PVG directly. It will spend an hour or a little longer.

And yes, there is a direct way. You can take airport shuttle buses at Wulinmen CAAC Ticket Office, Hangzhou.
The operating hours are from 05:30 to 17:00 with the frequency of an hours. It takes 3 hours on the way. The ticket fare is CNY 110 per person.This way is the fastest and easiest way for you to choose.