Abstract: This article uses the first set of NCEP/NCAR monthly reanalysis data and National Climate Center's 160 stations of monthly precipitation and temperature data from 1951 to 2011.The Tibetan Plateau summer monsoon index is positive (negative) correlate with the summer precipitation (temperature) of the Yangtze River (both passed the 95% significance test).The Tibetan Plateau summer monsoon obvious inter annual and decadal variability,1979 is a mutation.Between The Tibetan Plateau summer monsoon index and the subtropical high and the characteristic parameters of the SAH is a good correlation.when the Tibetan Plateau summer monsoon is strong (weak),the South Asian High appears the modal of The Tibetan Plateau (The Iranian plateau),and it becomes weakening (intensity) and eastward (west retreat),at this time,the subtropical high appears enhancement (weak) and westward (east retreat).The Characteristic parameters of the SAH carried out the common of 2-4 year cycle oscillation,however,between The Tibetan Plateau summer monsoon and the main center of longitude (latitude) of the South Asian high at 3 to 5 years (at 3 to 4 years and 5 to 6 years) is the best significant relationship.