A pot experiment was conducted to study the measurements of plant volume and leaf area of Ptadtyctadus orientates and their relations to plant height, crown breadth and leaf area index(LAI). Results show that physical volume increased with the increase of cuboid and cylinder volume and had linear and extremely significantly positive correlation with cuboid and cylinder volume. With increasing crown width, physical volume and total leaf area presented linearity(R=0.572) and downward opening parabolas(R=0.450). When crown width was 73 cm, cylinder lateral area was 0.546 m² and cylinder cross sectional area was 0.329 m², corresponding total leaf areas reached the maximum values of 3581, 3639 and 3523 cm², respectively. With increasing total leaf area, leaf and branch volumes and physical volume presented downward opening parabolas, which all showed a significantly positive correlation with total leaf area. With increasing leaf volume, leaf area index presented an upward opening parabola. When leaf volume was 338 cm³, leaf area index reached a maximum value of 6.1.