WITH TICKET FROM BEIJING TO SHANGHAI, CAN I BREAK JOURNEY AT DEZHOU FOR ONE DAY,THEN GO TO SHANGAI

if you plan to break at Dezhou, i would suggest that you buy two ticket, one is from Beijing to Dezhou, and the other is from Dezhou to shanghai.
with one ticket from Beijing to Shanghai, you can alight at Dezhou, but your ticket will expire at that time, so you have to buy a new ticket to continue your journey.