This paper, based on panel data of China's 30 provinces during 2011 to 2017, uses super-SBM model to measure the green technical innovation efficiency, which is dynamically analyzed by means of ML index. Spatial lagging model is used to study the key factors of the green technical innovation efficiency. China's green technical innovation efficiency shows an increasing trend, low but leaving room for improvement, also varies with regions, decreasing westward. Improvement of the green technical innovation level is a mutually attributed by technical efficiency and technical advances. The green technical innovation efficiency is positively influenced by industrial structure, regional openness and educational level, little by environmental regulations and research and development input.