I agree with the above. Your technical stop in TAO will require you to leave the aircraft and clear immigration as you will then travel on as a domestic passenger. Whether you will need to clear your baggage for customs in TAO or XIA depends on how the airline and airports handle that situation, in principle it should be in XIA but it depends if they can separate your international bags from the domestic bags for customs formalities whilst you arrive as a domestic passenger.
If you have any doubt about the fact that you need a visa for this journey then contact your local Chinese embassy for advice, but by my understanding of the situation you do need a visa but please report back on your experience.