From Renqiu to Cangzhou, there is a bus at the state-run station, but it is too far away to be convenient. You can take a bus from the West Ring Road (the only way), or you can take a bus at Water Conservancy Bureau, Transportation Bureau, Qiaotou Road, Baoding Road and Huayou Shopping Plaza. It is better to take a state-owned bus. Some cars transfer from Hejian to Cangzhou, and some cars transfer from xian county to Cangzhou. There are quite a lot of cars, every 20 to 30 minutes. General 15 yuan is enough. I have, but I don't think it will take an hour and a half (maybe by sports car). If you are in a hurry, you'd better calculate the time on the road, and the plan can't keep up with the changes.
Cangzhou No.2 base takes two hours in 25 yuan, and it's probably more expensive to go to the state-run station.