Beijing had won just one of their previous four away matches and they suffered more disappointment today as a 32nd-minute goal from Carmelo Valencia earned mid-table Tianjin a third successive victory.
Fifth-placed Shanghai Shenhua bounced back from their defeat to leaders Guangzhou Evergrande last time out with a 2-1 home victory over Jiangsu Shuntian, although they had to do it the hard way.
They trailed at the break to a 31st-minute Xiang Ji goal, but Eduardo Dady drew the home side level soon after the restart and Xu Liang 's winner 18 minutes from time earned Shanghai a fourth win in five games.
Second-bottom Changchun Yatai claimed their second win in three matches as they beat Dalian Aerbin 2-0 with goals either side of half-time from Felix Isac and Eninho, while in today's other match Hangzhou Greentown drew 1-1 with bottom side Wuhan Zall.
Xuan Cao's 34th-minute effort put Hangzhou ahead but Wuhan drew level eight minutes into the second half through Luo Li to earn a point.