In order to build a higher quality central private network and meet the needs of central users for high speed, high reliability and high utilization, a new optical transport network (OTN) technology --Liquid OTN is used to carry the existing network services. The frame structure of Liquid OTN and the advantages of Liquid OTN over traditional OTN and multi service optical transport network (MS-OTN) are introduced. This paper verifies the application effect of Liquid OTN equipment, the results show that Liquid OTN equipment has the characteristics of high speed, low delay and high expansion.