Abstract: Manmade fruiters provide fixed and standard objects in the ground-based leaf area index and biomass measurement for avoiding time and space effect on the real fruiter in the real environment. Firstly, the coordinates of the real guava’s leaves and branches were gained by 3D digitalizer named Polhemus Fastrak. Secondly, a manmade guava was made with a kind of special simulating techniques which was applied for Chinese patent. By means of digital pictures, coordinates of leaves and braches and virtual guava, the manmade tree has been adjusted many times over three months to reach the simulating effect. Finally, the man-made tree was compared and analyzed with the real one in parts such as coordinates, height, leaf area, shadowed area distribution. As a result of analysis by SPSS software, for the manmade guava the R square between tree height and accumulative leaf area is 0.9892 and the R square between shadowed area and accumulative leaf area is 0.9973. Additionally, for error analysis between the real one and the manmade one, the profile is basically the same by comparing digital pictures in different visions and the profile size error is less than 3%; the coordinates of leaves obey the normal school after analyzing 3 014 leaf points and 9 042 coordinate points; the accumulative leaf area error is less than 5% and accumulative shadowed area error is less than 20% from 0 to 65 cm of the tree height.