In this article we use the absolute and relative gravity observation data in 2018 to analyze the stability of the Lushan gravity baseline,in which the relative gravity measurement is under control of the absolute gravity observation. The results show that the Lushan baseline gravity variation during 2015～2018 is -11.6～13.4μGal and the average value is -0.962μGal. The small gravity variation indicates that the Lushan short gravity baseline is relatively stable. The gravity variation during 2000～2018 is -39～33.5μGal with average value of -0.275μGal. G16 is as a turning point,where gravity changes on the uphill side(G16～JZ04)are relatively gentle(about -3μGal),and the downhill side(G03～G16)changes significantly due to the gravity change at the G04 and G14 station(respectively -24.95,-18.5μGal). The ratio of gravity change to section gravity difference(B)is 1.19×10^-4～3.58×10^-3. Rate of gravity change caused by vertical movement in Lushan area is 0.7543±0.16μGal/a. The recent seismic activity is characterized by small magnitudes and concentrated distribution along the fault zone,and gravity changes have a greater impact on the calibration results of the relative gravimeter(proportional to the value of B),while little influence on correction accuracy. When using the previous gravity observation results to calculate calibration,the error influence of the absolute gravity measurement section JZ02～JZ04 is less than the maximum gravity difference section. Regular maintenance and re-measurement are effective way to maintain high-precision gravity baseline.