Is it possible to implant a chip locator system into the human body? If it is possible, it will be good to find your child if he/she is lost in the future.

Your idea is good, but the current technology is not very realistic, may be in science fiction films, animals implanted in the body of the microchip is a recognition chip, which is a readable memory, there is an identification code and other information, scanning with a special device can be read out the internal data, but there is no positioning function.　The locator is required to power, the volume is generally large collar type, power can only be used for a few months at most, GPS this kind of, need to receive the signal and then transmit the signal, power consumption is greater. There is another kind is only transmit microwave signals, and then rely on the receiver to accept to locate, power consumption to be smaller. That's why it's generally used in cell phones and watches, and even if you've heard of where it's been used, it's only in the experimental stage. So that's science fiction, not reality, at least not at the moment