After processing 204 data of historical earthquakes for M≥4.5 from 1900 to 1996 in the area centered at Beijing (39.9°N, 116.4° E; ±3°), two correlations have been suggested: One is between earthquake and the position distribution of major solar system bodies; the other is between the earthquake magnitude and the tidal force at the epicenter. A tentative is presented for future seism prediction. Because this work is at the test stage based on a statistic analysis, further test and verification are expected. After processing 204 data of historical earthquakes for M ≧ 4.5 from 1900 to 1996 in the area centered at Beijing (39.9 ° N, 116.4 ° E; ± 3 °), both correlations have been suggested: One is between earthquake and the position distribution of major solar system bodies; the other is between the earthquake magnitude and the tidal force at the epicenter. A tentative is presented for future seism prediction. Because this work is at the test stage based on a statistic analysis, further test and verification are expected.