Abstract: Based on Systemic Functional Linguistics，this paper aims to explore the complex aspectuality system of English.This study shows that the complex aspectuality is classified into complex viewpoint aspect which refers to the homogeneous or heterogeneous ways continuously viewing on the same situation by the speaker and complex situation aspect which is the combined configuration of the internal time schemata of situation.Through viewpoint shifting and repeating，the complex viewpoint aspect is formed in two combination ways.Complex situation aspect is combined by the way of hypotactic verbal complex and the limitation of participant and circumstance in a clause.