Abstract: Lancang River is an international river flowing from China to Vietnam via Myanmar,Laos,Thailand and Cambodia.The downstream river from the border of China,Laos and Myanmar to the river mouth is called Mekong River.Lancang is the largest international river in China and one of very important hydropower bases in sout hwest China.There are 8 cascade dams are planned which one completed.Lancang river basin abounds with natural resources and has great potential for further development,but the water resources development is lower.The further development will focus on hydropower,navigation and irrigation.The development has some special characters,i.e.integrated,hydropower priority and international cooperation.Refer to international river and riparian countries concerns,the water resources development in Lancang should follow principles of peacefuluse,friendly negotiation and equal mutual benefits.