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The daily precipitation data of Shanxi Province from 1979 to 2010 and the reanalysis dataset of the European Centre for MediumRange Weather Forecasts are used to explore the relationship between atmospheric lowfrequency oscillations in the Eurasian region and the precipitation weather process of Shanxi Province from April to September by the diagnostic analysis method. The results indicate that the daily precipitation patterns in Shanxi can be mainly divided into three types: provincial consistency, NorthCentral, and Central types. Daily precipitation in Shanxi obviously varies with a characteristic of quasibiweekly cycle. The lowfrequency key region of 500 hPa influencing the precipitation in Shanxi is near the Bohai Sea on the East Coast of China and the lowfrequency influence system is the Bohai Sea lowfrequency high. The Bohai Sea lowfrequency high varies with the quasibiweekly cycle. The index of the Bohai Sea lowfrequency high turns into positive phase 0 to 3 days before the precipitation occurrence in Shanxi. The Bohai Sea lowfrequency high originates from the West Siberian lowfrequency high, which is mainly located in east of West Siberia to west of Central Siberia and propagates to the Bohai Sea about a quasibiweekly cycle.