中文摘要：

动力学可容变分方法是一种广义哈密顿系统中的李扰动变换方法，能自动保证卡西米尔函数在相应阶数上的守恒性质．通过动力学可容方法得到了双流体在欧拉描述中的一组约束变分，而后利用这组变分对双流体哈密顿量取极值得到了平衡方程．

英文摘要：

Dynamically accessible perturbation is a type of Lie perturbation for noncanonical Hamiltonian systems. Firstly, a set of first-order constraint variations that preserve all the Casimir functions is presented based on the two-fluid Poisson bracket. Then the equilibrium equations are given by minimizing the two-fluid Hamiltonian with these variations.