Question: please tell me, How to plot this type figure (see, [![enter image description here](https://i.stack.imgur.com/wDmGS.jpg)](https://i.stack.imgur.com/wDmGS.jpg)attached file) in latex?

Answer: 
You can use `tikz-cd` for this.

```
% arara: pdflatex

\documentclass{article}
\usepackage{tikz-cd}
\usepackage{mathtools}

\begin{document}    
\[
\begin{tikzcd}[%
    ,row sep={.5cm,between origins}
    ,every arrow/.append style=Rightarrow
    ]
& \dfrac{h}{H} \drar & \\
\dfrac{f}{g} \drar\urar & & F(z) \\
& \dfrac{G}{Z} \urar
\end{tikzcd}
\]
\end{document}

```

[![enter image description here](https://i.stack.imgur.com/Yni9R.png)](https://i.stack.imgur.com/Yni9R.png)
This is a quick solution

```
\documentclass{article}
\usepackage{tikz}  
\usetikzlibrary{positioning}

\begin{document}

\begin{tikzpicture}[node distance=\baselineskip and 1cm]
   \node (start) {$\frac{f}{g}$};
   \node[above right=of start] (mid-high) {$\frac{h}{H}$};
   \node[below right=of start] (mid-low) {$\frac{G}{Z}$};
   \node[below right=of mid-high] (end) {$F(Z)$};

   \foreach \s/\e in {start/mid-high,start/mid-low,mid-low/end,mid-high/end}  {
       \path (\s) --node[sloped] {$\Rightarrow$} (\e);
   }
\end{tikzpicture}

\end{document}

```