In this paper, a study of the eruptive prominence on 29 August 1990 has been
presented. The 
filtergrams and the 
spectra of the
prominence are given to study its morphological evolution and kinematic
characteristics.
The main results are (1) the rising velocity of the altitude of the prominence
(about 71 km/s)
is over twice as large as the falling velocity (about 33.7 km/s), the
formation
time of the prominence is about half as much as the decay time.
The formation stage of the prominence demonstrated that the materials in the prominence were supplied during the emergence of helical flux tubes; (2) the materials in the prominence spired to rise, then after reaching the climax, they dropped in succession, but did not spiral. The velocity along the line of sight increased from the bottom to the top of the prominence. We suggest but do not confirm that the angular velocity increased from the bottom to the top due to the release of torsion of the prominence. During the period of the development of the prominence, three loop structures were formed, and we think that the material ejection was intermittent.
Acknowledgements
We thank the referee for very useful comments. This paper has been prepared on the VAX-8350 Computer at Yunnan Observatory, and we both thank the clerks of the VAX-8350 Computer Group. This work is supported by the President's Foundation of the Chinese Academy of Sciences.