Inositol phosphates, as important second messengers of signal transduction, regulate many biological functions. However, cell penetration and phospholipase stability could be two main issues faced by inositol phosphate analogues used as lead compounds for drug discovery. Inositol phosphotriester analogues could be more beneficial to diffuse across plasma membrane. In this paper, we describe the design and synthesis of a series of inositol phosphotriester analogues based on phosphatidylinositol, along with the initial antitumor activity analysis. Several compounds exhibited good cytotoxic activity against human cancer cell lines A549, HepG2, MDA-MB-231 and HeLa, especially compound 33 was cytotoxic against all the four cancer cell lines with good IC₅₀ values.