Abstract: The structure of atmosphere and the evolution of the subtropical jet and subtropical high during the period May 22-July 3, 1958, are studied by means of tropopause map. The following facts are obtained: (1) The three-fold structure of atmosphere is also rather clear in the early summer, hence tropopause maps can still be used in Summer in analysing the general circulation in the upper troposphere. (2) During this period, there are six or seven waves on the subtropical jet over the hemisphere. The amplitude and number of waves change periodically with a period of about 15 days. (3) There is a sudden northward shift of the subtropical jet at the beginning and end of June when the amplitude of subtropical jet waves increases. (4) The northward shift of the axis of the subtropical high at 200 mb is consistent with the northward shift of the subtropical jet.