Flag of Cambodia and Its Meanings

Historical national flags

Flag	Duration	Use
	1863- March 1945, October 1945-1948	Flag of Cambodia under French protection
	March - October 1945	Flag of the short-lived Cambodian Pro-Tokyo puppet state established under the Japanese occupation of Cambodia
	1948–1970, 1993–present	Flag of the Kingdom of Cambodia
	1970–1975	Flag of the Khmer Republic
	1975–1979	Flag of Democratic Kampuchea
	1979–1989	Flag of the People's Republic of Kampuchea
	1989–1991	Flag of the State of Cambodia[1]
	1992–1993	Flag of the United Nations Transitional Authority in Cambodia (UNTAC)

Current Cambodian Flag:

This is the current national Flag of the Kingdom of Cambodia. The flag consists of three horizontal stripes; the two equal size blue and the larger red with Angkor in the middle. The flag was adopted by former King Sihanouk in October of 1948 and had been the national flag until October of 1970. After several changing regimes. This original design was readopted in 1993 with the reestablishment of the monarchy. The only minor change made from the original is the change of the outline color from red to black. However, interesting enough I have noticed that some websites including the ones of the government of the kingdom still use the original one with Angkor's red outline.

The Meaning of Cambodian Flag
The blue color of the two top and bottom horizontal stripes symbolizes the kingdom's royalty. The red color of the larger center stripe represents the kingdom's religion from Brahmanism to today's Buddhism. Angkor represents glorious period of the empire.

Another website source states:
According to Ancient and Heraldic traditions much symbolism is associated with colors. The colors on the Cambodia flag represent the following:

* Red - hardiness, bravery, strength & valour.
* Blue - vigilance, truth and loyalty, perseverance & justice.

Reference:
http://en.wikipedia.org/wiki/Flag_of_Cambodia
http://www.worldflags101.com/c/cambodia-flag.aspx
http://www.khmercity.net/forum/topics/khmer-flag-and-its-meanings?xg_source=activity
 http://www.muzik-online.net/