1.以分枝过程与随机合并过程能相互作出有价值的贡献为一出发点, 建立了连续状态分枝过程的新的随机流，我们系统研究此类随机流的分布性质并致力于从此随机流中诱导出一类新的随机合并过程。2.研究随机分片与合并过程，特别是考虑带弱分片的可加溯祖过程的极限行为。3.我们考虑Galton-Watson树上的停车问题的相变现象，此研究将深化对分枝过程的理解。

1.Branching process and stochastic coalescent contribute from each other. We establish a new class of stochastic flows for continuous state branching processes. We investigate systematically the distribution property of the class of stochastic flows and aim to find a new class of stochastic coalescent embedding in the flow. 2.We study random fragmentation and stochastic coalescent, especially we investigate the asymptotic behavior of additive coalescent with erosion. 3.We consider the phase transition problem of parking on the Galton-Watson tree, which will give a better understanding of branching processes.