Longan　is　subtropical　fruit　of　the　Sapindaceae　family.　The　potential　for　higher　profit　brings　about　an　upsurge　of　studies　to　improve　the　yield　of　longan.　In　order　to　shorten　the　test　cycle　and　obtain　valuable　insights　into　the　nature　of　longan,　it　is　necessary　to　construct　virtual　longan　tree　models　which　are　in　accordance　with　natural　growth　law.　Taking　intricate　branches　structure　of　longan　tree　into　account,　a　classical　method　of　modeling　the　trees　based　on　the　theory　of　Lindenmayer　systems　(L-Systems)　primarily　serves　as　platforms　for　reconstructing　the　architecture　of　longan　tree.　The　great　drawback　of　the　traditional　tree　modeling　methods　is　neglecting　biological　meaning　and　the　actual　development　and　growth　process.　Therefore,　the　primary　technical　contribution　of　the　paper　is　integrating　surveying　data　and　botanical　features　of　longan　tree　into　L-Systems　by　the　parametrical　modus　for　achieving　the　actual　growth　process.　Besides,　the　stochastic　mechanism　is　considered　to　modify　the　details　of　branches　in　order　to　reflect　the　differences　between　trees.　Furthermore,　three-dimensional　visualization　technology　is　primarily　responsible　for　livingly　representing　models　of　longan　tree.　A　tree　designer　based　on　L-Systems　(LSTD)　has　been　developed　to　confirm　the　validity　of　the　method　above.　The　growth　models　of　longan　tree　in　different　periods　are　really　simulated.　The　experimental　results　are　very　encouraging　and　convincing.