Well, for an economical way, take the only train from Yiwu to Beijing firstly (22 hours) and then catch a train from Beijing West Railway Station to Handan (5 hours).

Or, have a transfer at Hangzhou. Go to Hangzhou from Yiwu by bus or train (1.5hours)and then take train to Beijing. The bullet train just takes 11.5 hours.

As for flight, there is one flight to Beijing from Yiwu everyday. Then, take a train to Handan~ Hope not complicated!