《药师经》是药师信仰的主要经典，在中国译经史上先后五次被译为汉语，除刘宋译本以外，其他四个译本在《大正藏》中皆有保存，但仅有唐义净译《药师琉璃光七佛本愿功德经》传入西夏，西夏僧人据义净汉译本翻译成西夏文，在黑水城、敦煌出土的西夏文文献中有一定保存。本文主要对黑水城出土西夏文《药师琉璃光七佛本愿功德经》及其仪轨进行梳理，尤其通过对英藏黑水城西夏文残经的译释，确定其存世数量并纠正定名错误 ；然后考证了《药师琉璃光七佛本愿功德经》被翻译成西夏文的年代，并分析了西夏僧人德慧封号及其集撰《药师琉璃光七佛烧施（护摩）法事》的年代 ；最后分析了《药师琉璃光七佛本愿功德经》在西夏流传的诸多因素。

The Sutra of Bhaisajyaguru serves as the primary scripture for the Bhaisajyaguru faith. In the history of 
sutra translation in China, it has been translated into Chinese five times. With the exception of the Liu Song Dynasty translation, the other four versions are preserved in Taishō Tripiṭaka. However, only Bhaisajyaguru-Vaidūrya-Prabhāsa-Saptabuddha-Pūrva-Pranidhana-Sūtra, translated by Yijing of the Tang Dynasty, was transmitted to Tangut. Tangut monks translated Yijing’s Chinese version into Tangut, with some copies preserved in Tangut texts unearthed at Khara-Khoto and Dunhuang. This paper primarily examines the Tangut version of Bhaisajyaguru-Vaidūrya-Prabhāsa-Saptabuddha-Pūrva-Pranidhana-Sūtra unearthed at Khara-Khoto, along with its ritual practices. Specifically, by translating and interpreting Tangut scripture fragments from Khara-Khoto held in British collections, this paper determines the number of extant pages and corrects erroneous indentifications. Subsequently, it investigates the date of the Tangut translation of the sutra and the Tangut monk Dehui’s honorary title as well as his compilation of Homa Ritual for the Bhaisajyaguru-Vaidūrya- Prabhāsa-Saptabuddha, and finally examines various influencing factors of the circulation of the sutra within Tangut.