One entry visa and and travel visa in combiantion with reentry

Right now i have an one-entry for three months. iam already 2 2/1 months here and decided to go to holidays in thailand at my last week in china. i would come back to shanghai one day before my actual flight back home to germany from shanghai will depart. So re-entry to china with china eastern from thailand would be 30.01 and i would leave totally with lufthansa at 31.01. Can i use the travel visa for that?