Annular gas channeling is a potential problem in almost all natural gas well cementing. Sebei natural gas field is a middle-shallow depth gas field of the Quaternary with poor diagenesis and strong shale hydration & dispersion, strong pressure sensitivity and water sensitivity; in long gas well segment, gas layer and water layer are interbedding with multiple thin gas layers; the low compressive strength of formation rock leads to very low second interface bonding strength of cement ring, it is difficult to improve the second interface quality, gas channeling, water channeling and interstratified channeling are easy to occur. Therefore, how to improve the sealing of the annular space, improve the cementing quality and ensure the integrity of the wellboe becomes a problem that needs to be solved. In view of the special geological characteristics of the gas field, the factors affecting cementing quality are analyzed and the limitation for the application of cementing technology, anti-channeling slurry system and technological measures are studied and ECP is selected to deal with the annual channeling. The analysis results show that ECP can not only effectively prevent gas channeling cement channeling, but also can improve cementing quality and optimize casing program to ensure gas well safety and prolong service life. The application of ECP for gas channeling prevention and cementing quality improvement in Sebei gas field drill is practical.