[Objective]To study the pharmacognosy of Thymus quinquecostatus Celak.and provide basis for the further research of Thymus quinquecostatus Celak..[Methods]The paraffin section technology was used to observe the microscopic characteristics of stems and leaves of T.quinquecostatus Celak..The slide with chloral hydrate was used to observe the microscopic characteristics of the stems and leaves powder.[Results]There were exclusive characteristics in original plant,properties and microscopic aspects of Thymus quinquecostatus Celak..[Conclusion]The properties,microscopic and physiochemical characteristics of the T.quinquecostatus Celak.were studied in this research which will provide basis for the identification and the further research of Thymus quinquecostatus Celak.. [Objective] To study the pharmacognosy of Thymus quinquecostatus Celak. And provide basis for the further research of Thymus quinquecostatus Celak .. [Methods] The paraffin section technology was used to observe the microscopic characteristics of stems and leaves of T. quinquecostatus Celak. The slide with chloral hydrate was used to observe the microscopic characteristics of the stems and leaves powder. [Results] There were exclusive characteristics in original plant, properties and microscopic aspects of Thymus quinquecostatus Celak .. [Conclusion] The properties, microscopic and physiochemical characteristics of the T. quinquecostatus Celak.were studied in this research which will provide basis for the identification and the further research of Thymus quinquecostatus Celak.