This is a neuro-fuzzy network picture. I do not know how to draw in LaTeX.
Thanks to your help, I have drawn the following picture. Than you very much. But, the picture has some minor faults: the size of circles is different; how to adjust the size of text;the picture is a little big;...

\documentclass{article}
\usepackage{tikz}
\usepackage{float}
\usetikzlibrary{matrix}
\begin{document}
\begin{tikzpicture}[plain/.style={draw=none,fill=none},
net/.style={matrix of nodes,
nodes={draw,circle,minimum size=0.8cm},
nodes in empty cells,
column sep=1.9cm,
row sep=-6pt,
},
>=latex]
\matrix[net] (mat) {
|[plain]| \parbox{1.3cm}{\centering Input\\layer} &|[plain]| \parbox{1.3cm}{\centering E\\Function} &|[plain]| \parbox{1.3cm}{\centering H\\Function} &
|[plain]| \parbox{1.3cm}{\centering Output\\layer} \\
|[plain]| \\
|[plain]| & {$A_{11}$} \\
|[plain]| \\
{$x_1$} & {$A_{12}$}& {$h_{1}$}\\
|[plain]| &|[plain]| {\textbf{$\vdots$}}& |[plain]| \\
|[plain]| & {$A_{1n}$}&|[plain]| &|[plain]| \\
|[plain]| \\
|[plain]| & {$A_{21}$} &|[plain]| &|[plain]|\\
|[plain]| \\
{$x_2$} & {$A_{22}$}& {$h_{2}$}&{z}\\
|[plain]| &|[plain]| {\textbf{$\vdots$}}& |[plain]| \\
|[plain]| & {$A_{2n}$} \\
|[plain]| \\
|[plain]| & {$A_{m1}$} \\
|[plain]| \\
{$x_m$} & {$A_{m2}$}& {$h_{n}$}\\
|[plain]| &|[plain]| {\textbf{$\vdots$}}& |[plain]| \\
|[plain]| & {$A_{mn}$} \\
};
\foreach \xo in {5}{
\foreach \aio in {3,5,7}
\draw[->] (mat-\xo-1) -- (mat-\aio-2);}
\foreach \xt in {11}{
\foreach \ait in {9,11,13}
\draw[->] (mat-\xt-1) -- (mat-\ait-2);}
\foreach \xh in {17}{
\foreach \aih in {15,17,19}
\draw[->] (mat-\xh-1) -- (mat-\aih-2);}
\foreach \ai in {3,9,15}{
\foreach \hi in {5}
\draw[->] (mat-\ai-2) -- (mat-\hi-3);}
\foreach \ai in {5,11,17}{
\foreach \hi in {11}
\draw[->] (mat-\ai-2) -- (mat-\hi-3);}
\foreach \ai in {7,13,19}{
\foreach \hi in {17}
\draw[->] (mat-\ai-2) -- (mat-\hi-3);}
\foreach \hi in {5,11,17}{
\foreach \z in {11}
\draw[->] (mat-\hi-3) -- (mat-\z-4);}
\end{tikzpicture}
\end{document}


