Coming to China I had an impression of cops being on every street corner to make sure there is no dissent in the population or speaking about the government. Specially, since this is a communist country. Little to my surprise that I really don't feel a major police presence in the cities I've visited in China. You see them around here and there but that is all. Even driving around I have yet seen a cop have someone stop along the side of the road to issue a driving ticket. I think I have seen the Two Harbors police force more than I have over here and its rare occasion that I see the THPD unless it's breakfast time and all the cops and deputies are parked at Blackwood's eating.
For a city of 12 million Tianjin i would say has less cops than New York, or any city of the same size in the states. I know that some might be undercover or something else. I think it's about the Chinese personality about keeping in harmony.