The quantization and coding control in MPEG-2 standardization effort are described, in which the quantization scheme of MPEG-1 is as the contrast to H.261 and JPEG, scanning and two-dimensional VLC are in preparation for the MPEG second phase coding problems. Rate control methods in the SM3 and TM's are described with some non-trivial detected defects. The high quality and loss less coding in the DCT coding is discussed for future use.