Abstract: The paper analyzes the safety complication of the coal-bed gas transportation technology, and points outthat it is the separation and purification technology and the high explosion limit that limits the coal-bed gas transportation in pressure line.The authors analyze the practicability of the pressure swing adsorption method in coal-bed gas separation and purification, puts forward that the rising of the temperature and pressure will broaden the explosion limits, therefore, the transportation temperature and pressure should be lowered as far as possible under the condition of satisfied the transportation technology.If the gas within the explosion limits, eertain amount of inert gas should be added so as to meet the needs of the transportation technique.