In recent years, there have been many unexpected events such as earthquake and tsunami in the world. Because of the uncertainty and the damage of the emergency, the time and quantity of material demand in disaster areas are random, the time and quantity to send supplies is also random. In order to solve the problem of random emergency demand, using the method of system simulation, it provides a reasonable solution to the problem of the random demand. In a period of time, through the statistics of daily material consumption in disaster area, deducing the mathematical laws that are generally obeyed, and ultimately calculate the best amount of transmission per day. Combined with an example of the daily distribution of the earthquake relief, using computer programming simulation, getting the best daily amount of transmission.