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To explore the Li Na’s technical performance in the Australian tennis Open, and provide reference for Chinese women’s tennis development, results show that: after a foreign coach Carlos’ technical and tactical improvement, Li Na reduced the speed in the service, emphasized the angle and placement, and ACE number did not fall instead of increases, scoring rate in 2013 increased by 1 percentage points than in 2011. The return of serve win rate is increased year by year, from the first 48.5% increased to 52.2% in 2013, an increase of 3.5 percentage points. The Internet times are increased year by year, but the net score rate is less than rivals. She wined more than rival but more unforced mistakes than rivals at the same time.