You can use the anchor like that:
\documentclass[tikz]{standalone} \usepackage{xcolor} \usetikzlibrary{positioning} \tikzstyle{process} = [rectangle, minimum width=3cm, text width=3cm, minimum height=1cm, text centered, draw=black, fill=orange!30] \begin{document} \begin{tikzpicture}[node distance = 1cm] \node[process](step1){Step 1 \\ AAAAA \\BBBB \\ CCC}; \node[process, anchor=north](ste2) at (step1.south) {Step 2}; \end{tikzpicture} \end{document} EDIT: Alternative you can use the below = of option. Like that:
\documentclass[tikz]{standalone} \usepackage{xcolor} \usetikzlibrary{positioning} \tikzstyle{process} = [rectangle, minimum width=3cm, text width=3cm, minimum height=1cm, text centered, draw=black, fill=orange!30] \begin{document} \begin{tikzpicture}[node distance = 1cm] \node[process](step1){Step 1 \\ AAAAA \\BBBB \\ CCC}; \node[process, below = 0cm of step1](ste2) {Step 2}; \end{tikzpicture} \end{document}