In this article, the top 15 golfers are chosen for the top-level group and another 15 golfers ranking from 56 to 70 are chosen for the comparison group, according to the world ranking of PGA TOUR. The two groups are the main objects of study. This research aims to better understand the difference of competitiveness of the two groups, using mathematics statistics and comparative studies. First, average driving distance, driving accuracy percentage, greens in regulation percentage, putting average, birdie average, sand save percentage, scoring average, putts per round and par breakers are analyzed through principal component analysis. The result shows that they all can reveal the competitiveness of the golfers and they can also be used for analyzing the competitiveness of other golfers of different levels. Then, the competitiveness of the golfers in the top-level group is compared with that of the golfers in the comparison group. And the result shows that average driving distance、birdie average、scoring average and par breakers of golfers in the top-level group are much better than those of the golfers in the comparison group where Wenchong Liang belongs, but there is no obvious difference of the other 5 aspects.