Ho Chi Minh City is a crowded city in the South of Vietnam. From 1979 to 2009 the population of Ho Chi Minh City was rising very fast. In 1979, Ho Chi Minh City has about 3,420 people. After ten years, it increases a little with the number 3,988. Until 1999, it began to change so much, the population at this time is 5,037. And 2009, there were 7,123, and the population increased by about 50%. We can see that the population had doubled in that period of 30 years. It has grown so fast in a short time! Consequently, the explosion of the population will be one of the unsolvable problems henceforth.