The three-dimensional packing problem has been widely used in many fields.At present，the research on three-dimensional packing for offline rectangular objects is extensive.The research on online 3D packing outside the rectangular body is relatively simple.This paper proposes a three-dimensional packing problem of online constrained variable size spheres.And gives a solution to the problem，Make the cells into cells by loading them into the appropriate rhombohedral dodecahs and then loading them；Furthermore，according to the weighting method，the competition ratio in the bounded environment can be obtained.It solves the problem of packing on the assembly line with different weights of the same type of goods.