A Kind of Method of Multi-dimensional Probability Density Function Structured by One-dimensional Probability Density Function

In the literature [1],the method structuring from the probability density function of one-dimensional continual random variable to the probability density function of two-dimensional continual random variable have been given.In this paper I have promoted the method produced in the literature [1].That is I have given the method structuring from the probability density function of one-dimensional continual random variable to the three-dimensional continual random variable.I have made the proof and given some examples to explain how to structure multi-dimensional probability density function,its method is easy and feasible.