In 1607, he published, with the help of Hsu Kuang-ch'i, a translation of the first six chapters of Euclid's Elements, and also wrote Ts'e-liang-fa I (Essentials of Surveying [Trigonometry]).
後在圖上加中文註釋，由李之藻協助在北京出版，名為「坤輿萬國全圖」。其中有幾個特色：一、說明地球是圓的。