目前广泛应用的节块格林函数法是基于第三类边界条件，这类格林函数比较复杂，并且不便直接使用不连续因子，必须经过转换后才能使用和功率重构。该文发展了第二类边界条件三维几何先进格林函数节块法。该方法的优点是格林函数计算较简单，便于在交界面处引入通量不连续因子，并通过功率重构得出堆芯内精细通量分布。基准计算表明，该程序精度高、速度快，成为水堆堆芯物理设计和燃料管理计算的核心程序。 Currently widely used nodal Green’s function method is based on the third type of boundary conditions, such Green’s function is more complicated, and inconvenient direct use of discontinuities, must be converted to use and power reconstruction. In this paper, the second type of boundary conditions for three-dimensional geometric advanced Green’s function nodal method. The advantage of this method is that the Green’s function is relatively simple to calculate, and it is easy to introduce the flux discontinuity at the interface, and the fine flux distribution inside the reactor is obtained through the power reconstruction. The benchmark calculation shows that the program is high precision and fast, and becomes the core program of physical design and fuel management calculation of water reactor core.