I have solved this problem. It's a problem with latex not org. Thanks for
replying to this.

Cheers,
Zhihao

On 6 August 2015 at 13:20, Zhihao Ding <zhihao.ding@gmail.com> wrote:

> I export the subtree, below is the org, and after that is the latex
>
> ===
>
> * projects
>
> :PROPERTIES:
> :header-args: :cache yes
> :EXPORT_DATE: \today
> :EXPORT_AUTHOR: myname
> :EXPORT_LaTeX_HEADER+: \usepackage{array}
> :EXPORT_LaTeX_HEADER+: \usepackage{tikz}
> :EXPORT_LATEX_HEADER+: \usepackage[margin=1in]{geometry}
> :EXPORT_LaTeX_HEADER+: \usepackage{algpseudocode}
> :EXPORT_LaTeX_HEADER+: \usepackage[extendedchars]{grffile}
> :EXPORT_LaTeX_HEADER+: \usepackage[T1]{fontenc}
> :EXPORT_TITLE: my title
> :EXPORT_FILE_NAME: mypdf.pdf
> :EXPORT_OPTIONS: H:3 toc:nil *:t ^:nil :t
> :EXPORT_LaTeX_CLASS: beamer
> :EXPORT_SELECT_TAGS: export
> :EXPORT_EXCLUDE_TAGS: noexport
>
> :END:
>
>
> ** Data
> *** Test
> **** Slide
>      - item
>
>
> ===
>
>
> % Created 2015-08-06 Thu 13:20
> \documentclass[presentation]{beamer}
> \usepackage[utf8]{inputenc}
> \usepackage[T1]{fontenc}
> \usepackage{fixltx2e}
> \usepackage{graphicx}
> \usepackage{longtable}
> \usepackage{float}
> \usepackage{wrapfig}
> \usepackage{rotating}
> \usepackage[normalem]{ulem}
> \usepackage{amsmath}
> \usepackage{textcomp}
> \usepackage{marvosym}
> \usepackage{wasysym}
> \usepackage{amssymb}
> \usepackage{hyperref}
> \tolerance=1000
> \usepackage{array} \usepackage{tikz} \usepackage[margin=1in]{geometry}
> \usepackage{algpseudocode} \usepackage[extendedchars]{grffile}
> \usepackage[T1]{fontenc}
> \author{myname}
> \date{\today}
> \title{my title}
> \hypersetup{
>   pdfkeywords={},
>   pdfsubject={},
>   pdfcreator={Emacs 24.4.1 (Org mode 8.2.10)}}
> \begin{document}
>
> \maketitle
>
>
> \section{Data}
> \label{sec-1}
> \subsection{Test}
> \label{sec-1-1}
> \subsubsection{Slide}
> \label{sec-1-1-1}
> \begin{itemize}
> \item item
> \end{itemize}
> % Emacs 24.4.1 (Org mode 8.2.10)
> \end{document}
>
>
>
>
>
>
> On 6 August 2015 at 12:27, Eric S Fraga <e.fraga@ucl.ac.uk> wrote:
>
>> On Thursday,  6 Aug 2015 at 12:15, Zhihao Ding wrote:
>> > Hi guys,
>> >
>> > I had some problems producing beamer slides after I installed emacs and
>> org
>> > on a new computer. I am using emacs 24.4.1, and installed org (8.2.10
>> > org-2018-08-03) using elpa.
>> >
>> > I don't seem to be able to get the frame environment even when I set the
>> > "H" in the options, e.g.
>> >
>> > :EXPORT_OPTIONS: H:3 toc:nil *:t ^:nil :t
>> >
>> > It just gets to subsubsection and then stop. Any idea how to fix this?
>> > Thanks a lot!
>>
>> How are you exporting?  Can you post a small example file?
>>
>> --
>> : Eric S Fraga (0xFFFCF67D), Emacs 25.0.50.2, Org
>> release_8.3beta-1315-ga3b2b7
>>
>
>
>
> --
> Regards,
> Zhihao Ding
>



-- 
Regards,
Zhihao Ding