Cfrgtkky

I need to draw a flow chart with items in bullet points. I tried drawing using:

begin{tikzpicture}[node distance = 4cm, auto]

    % Place nodes



      node  [block] (init)

      {

      {dataset 

      begin{itemize}

       item Boundary dataset

       item Emission dataset

      end{itemize}}

      }



    node [block, below of=init] (identify) {Run Model  WRF-Chem};

    node [block, below of=identify] (evaluate) {Model Result item PM and ozone item fire and nofire values};

    node [block, below of=evaluate] (evaluation) {Result Validation item OM and ozone from instrument  item For AOD modis datas};

    % Draw edges

    path [line] (init) -- (identify);

    path [line] (identify) -- (evaluate);

    path [line] (evaluate) -- (evaluation);



end{tikzpicture}

I also tried:

begin{center}

begin{tikzpicture}[node distance = 4cm, auto]

begin{itemize}



    % Place nodes

    node [block] (init) {Data collection item Boundary dataset  item Emission dataset};

    node [block, below of=init] (identify) {Run Model item WRF-Chem};

    node [block, below of=identify] (evaluate) {Model Result item PM and ozone item fire and nofire values};

    node [block, below of=evaluate] (evaluation) {Result Validation item OM and ozone from instrument  item For AOD modis datas};

    % Draw edges

    path [line] (init) -- (identify);

    path [line] (identify) -- (evaluate);

    path [line] (evaluate) -- (evaluation);



end{itemize}

end{tikzpicture}

But the figure comes like the following:

How can I organize the bullets so that it comes in the exact place?

Your example is not complete, I've invented the definition of block and line.

You forgot begin{itemize} ... end{itemize} in two nodes.

After these two corrections, it works perfectly.

documentclass{article}

usepackage{amsmath}

usepackage{tikz}

usetikzlibrary{positioning,arrows.meta}

tikzset{

    block/.style={

        draw, 

        rounded corners,

        text width=12em,

        text centered,

        minimum height=20ex,

        fill=cyan!70!white

    },

    line/.style={

        draw, 

        -Stealth

    },

}

begin{document}

begin{tikzpicture}[node distance = 4cm, auto]

    % Place nodes

      node  [block] (init)

      {

      {dataset 

      begin{itemize}

       item Boundary dataset

       item Emission dataset

      end{itemize}}

      };

    node [block, below of=init] (identify) {Run Model  WRF-Chem};

    node [block, below of=identify] (evaluate) {Model Result begin{itemize}

    item PM and ozone 

    item fire and nofire values

    end{itemize}};

    node [block, below of=evaluate] (evaluation) {Result Validation begin{itemize}

    item OM and ozone from instrument  

    item For AOD modis datas

    end{itemize}};

    % Draw edges

    path [line] (init) -- (identify);

    path [line] (identify) -- (evaluate);

    path [line] (evaluate) -- (evaluation);

end{tikzpicture}



end{document}

mostly off-topic, since cause of your problem is already explained in CarLaTeX answer.

with using tikz libraries arrows.meta (for arrows), chains (for link nodes in chain and conect them by use of its macro join) andpositioning(to determine distance between nodes) , and the packageenumitem` (for lists in nodes) ypu can redesign your flowchart in the following look-out:

documentclass[tikz, margin=3mm]{standalone}

usetikzlibrary{arrows.meta, chains, positioning}

usepackage{enumitem}



begin{document}

    begin{tikzpicture}[

node distance = 3ex,

  start chain = going below,

every node/.style = {draw, rounded corners, fill=blue!20,

                     text width=11em, minimum height=12ex,

                     align=center,

                     on chain, join=by -Stealth}

                        ]

setlist[itemize,1]{nosep,

                    leftmargin=*}

%

node   {dataset

        begin{itemize}

   item Boundary dataset

   item Emission dataset

    end{itemize}};

node   {Run Model  WRF-Chem};

node   {Model Result

        begin{itemize}

   item PM and ozone

   item fire and nofire values

        end{itemize}};

node   {Result Validation

        begin{itemize}

   item OM and ozone from instrument

   item For AOD modis datas

        end{itemize}};

end{tikzpicture}

end{document}